Introduction: Office Booby Trap

Picture of Office Booby Trap

This is a fun little Booby Trap that fires objects when a trip wire is pulled.
It is made from a few simple items that can be found around the office or home.

Needless to say, be careful what you fire at people.

Step 1: What You Will Need

Picture of What You Will Need

3 Paper clips
Bottle Top
Rubber Band
Pliers (Needle-nose)
2 Drawing Pins

Step 2: Straighten the Paper Clips

Picture of Straighten the Paper Clips

Using your Pliers straighten the 3 Paper Clips.

Step 3: Make Four Holes in the Bottle Top

Picture of Make Four Holes in the Bottle Top

Turn the Bottle Top upwards and then using one of the Drawing Pins, make 2 holes at either end.

Make the holes at one end approx 2cm apart, and at the other end 1.5cm apart.

Step 4: Bend a Paper Clip and Insert Into Bottle Cap

Picture of Bend a Paper Clip and Insert Into Bottle Cap

Now bend one of the Paper Clips using the Pliers so that there is a 2cm gap in the middle of the two 'arms'.
This is going to be pushed through the holes in the Bottle Cap that are 2cm apart, so that the arms point out the top.

Step 5: Bend the Arms and Attach the Rubber Band

Picture of Bend the Arms and Attach the Rubber Band

Bends both the arms outwards slightly so they are at a 45 degree angle.
To attach the Rubber Band to the arms we need to roughly cut out a 4cm section of the Rubber Band and tie a knot in each end.

Now rest the Rubber Band between the tips of the two arms, then bend the tips of the arms around the Rubber Band and clamp them down. Making sure there is no room for the knots to slip though.

An image of the finished result of this Step is attached as the second Picture File.

Step 6: Bend the Other Paper Clip and Push Into Bottle Cap

Picture of Bend the Other Paper Clip and Push Into Bottle Cap

Exactly like Step 4, bend a Paper Clip but this time leave a 1.5cm gap in the middle.
Then push it through the two remaining holes.

Step 7: Bend the Two New Arms

Picture of Bend the Two New Arms

These two arms are what are going to hold the Firing-Latch in place, so they need to be bent closer together, and then have a loop made on the top of each.

You may find that before making the loops you need to cut around 0.5cm off the top of the arms, just to ensure that it is at half the height of the arms holding the Rubber Bands.

Do not fully close the loops as you will need to slip the Latch through them.

Step 8: Making the Firing-Latch

Picture of Making the Firing-Latch

This is the part of the Booby Trap that hooks onto the stretched Rubber Band until the trip wire is pulled.

You create this by bending your last Paper Clip in half, bending the end so that it forms a hook and then bending the two ends in on each other.
You can then attach it to the empty arms and tighten the loops you created in the last Step.

View the pictures below to gain a full understanding of what you need to do with the Paper Clip.
To adjust the sensitivty of your Booby Trap you simply change the angle of the hook.

Step 9: Attaching the Trip Wire

Picture of Attaching the Trip Wire

The trip wire is used to make the Latch raise, thus releasing the Rubber Band.

The trip wire is attached by making two holes in the Bottle Top. One on the top underneath the latch and the other below it, on the side.
Then feed through the string and tie it to the centre of the latch.

Step 10: Fixing It Down

Picture of Fixing It Down

When you set your Booby Trap you are going to want to stop it moving about and remove the possibility of being pulled over by the Trip Wire.

To give you the ability to fixed down make 4 holes. Two on one side of the Bottle Top and two on the other. Then thread some string through the holes and tie a knot.

All you need do now in order to fix your Booby Trap in place is to either Sticky Tape the string down, or use the two Drawing Pins like in the picture below.

This also gives it the ability to be fixed vertically to a door frame etc.

Step 11: Finished! - Try It Out

Picture of Finished! - Try It Out

It is now time to test your Booby Trap.

To load your Booby Trap simply pull back the Rubber Band and hook it on the Latches hook.
Then put whatever projectile you wish in front of the Rubber Band. You'll be surprised how far it shoots the object.

Below is a video of me testing the Booby Trap to make sure everything was working correctly.

Click here to view the video
*The video has been deleted from the original service I'd uploaded it to. I will be uploading it to YouTube shortly.

I wanted to make my Booby Trap more sensitive after filming this video. So altered the angle of the latches hook.

Comments, Pictures and Ideas are all greatly appreciated.

Any updates to this How-To will appear on my website


MaxA13 (author)2015-08-22

This is genius, I super-sized this and made it fit in my school locker, attaching the string to the door. The string goes through to the outside through the secondary lock hole, with 3 chain links tied to it. On top of it all, there is a key-lock on the chain, preventing someone from simply disarming it. on the outside you only see a chain link and key-lock, but can still open easily. so open the locker and... snap! It slings a plastic long-dart straight at them. and to dis-arm it from the outside, remove the lock.

Nailuj Winterson (author)MaxA132016-01-21

No friends will ever "borrow" pens again.....

rackhh (author)2015-06-19

not to shabby

rackhh (author)2015-06-19

Master Wasi 47 (author)2014-10-31

i like it

GR- (author)2013-07-18

It didn't work for me! I think my paper clips were too weak or something?? When I hooked the rubber band in place it would just pull back the paper clips instead of stretching the elastic

apashine (author)GR-2014-06-09

try using matchsticks and strengthining them with hot glue

paper kotik (author)2014-03-30

Like LIke LIKe

genemc (author)2014-02-05

why would jesus be perfect?

paper kotik (author)genemc2014-03-30


wwr (author)2013-07-25

whats the how to do it

angryrobot17 (author)2013-07-17

violent easy awesome a favorite for gaurding candy

Chuck210 (author)2013-06-08

I followed the steps step by step yet it only shoots 3 inches. Any suggestions?

ramayana (author)2013-03-10

its the best among all instructables.i like this the most.

Sassah122 (author)2013-03-03

This is the best instructable I HAVE SEEN SO FAR

ducttapefixeseverything (author)2011-11-29

cool but to hard

I think its an easy trap...

fishbob1234 (author)2012-08-18

a great way to get fired! but still a great idea!

killerhamstr (author)2012-08-08

This looks brilliant!
I'm thinking of adapting this to fire pens (
If i can get it working i'll upload it, should result in pretty good accuracy

Kawthar Xoubi (author)2012-08-07


jaberwaukee (author)2012-07-27

YOUR A FREAKING GENIUS!!!!!!!!!!!!!!!!!!!!!!!

neelsarode (author)2009-05-25

this takes foreverrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

Heat a nail over a fire and then poke it at the desired spot. It works, literally, like a hot knife through butter.

Or use the heated nail as projectile

evilmadcow (author)beehard442011-07-08

Your'e joking right?

beehard44 (author)evilmadcow2011-10-30

hell make me very mad wake up to 500 of these with heated nails by your bedside

evilmadcow (author)beehard442012-07-04

doing to brother now

dombeef (author)evilmadcow2011-07-08

you were the 500th comment!

evilmadcow (author)dombeef2011-07-23


dombeef (author)evilmadcow2011-07-23

Just saying :P

evilmadcow (author)dombeef2011-07-23


dombeef (author)evilmadcow2011-07-23


MrMadmonkey4 (author)beehard442010-04-12


Stuffses (author)beehard442010-04-05

 and it would cool down after a wile

Stuffses (author)beehard442010-04-05

 OUCH. but it would melt through the plastic, unless u used something metal

zack247 (author)beehard442010-03-20



markie (author)2012-01-18

thanx, this is the one i make. very nice for in the classroom XD

ninja_maker (author)markie2012-06-15

nice i like how u made the lower supports so it doesn't collapse in on itself

andyrewgr (author)2012-06-12

i built this, you forgot to mention that you need tou use SMALL paperclips, I found out the hard way, DON'T FIND OUT THE HARD WAY

ThatKnottyguy (author)2012-05-24

I used a drill. much easier! I LOVE this instructable! 5 stars for sure! 20 if I could!

papercrafter408 (author)2012-05-18

WELL GREAT... now i need to drink a bottle of water... ;)

mynameischeese (author)2009-01-16

How do you get such perfect bends? mine keep messing up!!!!

pyro man (author)mynameischeese2009-01-31


Nathanael.ama1 (author)pyro man2009-09-15

makes perfect

if practise makes perfect, but no body's perfect, then why practise?

im perfect

Gage987 (author)Perfect Sky2009-12-01

"Nobody is perfect
 I am nobody
 Therefore I am perfect"

seanthesheep101 (author)Gage9872011-06-30

Jesus is perfect

That's just what he WANTS you to think

About This Instructable




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