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This is a classic prank that's easy and annoying as hell.  It was pulled on me a few years ago and I was pissed, but impressed.

In the following steps I will explain how to put together a water-based obstacle that will annoy anyone and everyone and add a few tips for making it really evil.
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Step 1: Materials: cups and water

Picture of Materials: cups and water
I recommend little Dixie cups because I find they make this most annoying, but any plastic cup will do, large or small.  You also need a water source (sink, bucket, bottled water, whatever).  Depending on the size of the area you're going to prank, you may need a lot of cups and a lot of water (i.e. you might have to spend some money).

Step 2: The prank

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Simply stated, fill each cup with water (about half-way is good) and place them close together on the floor of the area you'd like to obstruct.  The closer together, the better.  You should not be able to step between the cups (or at least not easily).  Your prankee should find the set up and look upon it in awe, then quickly switch over to annoyance when they realize they have hundreds of tiny cups of water to dispose of to get to their bedroom/office/bathroom etc.

Step 3: Tips

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Though simple, this prank can take a while to set up, so make sure you have the time to pull it off.  If you're caught mid set-up, you'll probably be stuck dumping out the water and disposing of the cups while your prankee glares.  

Friends are helpful and so is a nearby sink.  An assembly line makes this move much faster.

Watch out for doors that open into your prank space and anything else that could knock over the cups.  The goal isn't for your prankee to open their bedroom door and take out two feet of cups.  You'd rather they to try to walk through the cups and THEN knock them over.  Or knock them over while cleaning them up.
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pcanywii1 year ago
you say its easy. its NOT!
i am going to do this ur awesome *5
naboo fighter!

You can also put grasshoppers or crickets under the cups. they are easy to catch and if your victim is afraid of bugs it is absolutely hilarious.
FrozenIce3 years ago
wow...... ur evil......u deserve 5 stars.....
patridged5 years ago
Staple the cups together at the top edges for a really evil setup!
I've had this style played on me before, and if works great! Besides cleaning up each cup, you are forced to drain each one first!
Tomasauk3 years ago
Three words:
Milk, Old milk

And set it up at night, while they are asleep, because you probably wont get caught.
lbruketa3 years ago
i have an idea that could enhance this prank, tho it would take much more time. especialy for larger areas. Tie all the cups together in a web like patter, that way if any1 tries to step between or move them, they all dump their contents
brittain1233 years ago
i would just jump them and make little clearings by drinking the cups
Plo Koon3 years ago
Truly evil. (Ha! Ha!) >=)
Plo Koon3 years ago
Bathroom would be best, because the victim might try to drink their way through, and if not, the sight of all that water might cause them to have to go more. >=)
if its a vinyl or concrete floor or something similar, use vegitable oil instead of water and watch them slide
Thats awesome! thats mean
That's cold...
opticalfx3 years ago
Being a janitor working at a CC I want to point out that if anyone did this in the dorms I clean several things would ensue;
1: I'd be cleaning it up, not the student the prank was pulled on.
2:I'd would not be cleaning the bathrooms or taking out the trash that day because I'd be to busy trying to get all the crap up and out of the carpet
3:If no one stepped up and claimed it then the entire hall would be charged for the cost of cleaning/damages

All I'm saying is take a moment and think of who would actually have to clean it up.
And don't forget the janitor has control of the toilet paper.
legless4 years ago
Frankly if this was done in my workplace I'd just go straight to the boss or call him if it impeded my work. If it was done on a concrete or tiled floor and the liquid caused someone to slip and get hurt, it could open up the employer to a lawsuit so someone's head would roll.

If nothing was going to be hurt by it, I would just walk (roll my chair in my case) right over them.
if you know your Victim will have to cross the sea of cups within a few minutes of finishing. add glue or some liquid latex (latex gets stuck in fabric big time!) in some cups and add a tripwire so they will fall down.
kooldoode4 years ago
hahaha i think this one works better with mouse traps, lolz less mess but still the same concept.
jake4a44 years ago
Here are some things that help if you're an evil pranker.

-Fill the cups up almost completely instead of halfway. This will make cleaning it up tougher.

-Use fishing line to make a tripwire. When they're cleaning, they will trip and spill some, while landing on the rest of the cups.

-Put a drop of something clear and disgusting into each cup. When cleaning it, they may take a sip of the water (instinct) and be grossed out. Some good ideas are: Lime juice, Castor oil, etc.

-Fill the cups with something that stinks.

-Use duct tape to make a giant floor of cups. Make 2x1 cups, put 2 together, make 2x2 cups, put 2 together, make 4x2 cups, put 2 together, make 4x4, put 2 together, etc. untill you have a giant unit of cups which you can fill up with a bottle/pitcher.

-Think up yo own!
zours1014 years ago
cup the street!!
livi6114 years ago
i might just keep pouring the water into the cups(since they would only be half full) until i had a path. i could drink some too, but there would be too much of it.
I would just kick them all down, make a big mess, then tell them that they put the cups there, so they can clean it up.
do it with elmers glue. MWAHAHAHAHA!!!
macmundi4 years ago
Its not funny for whoever's gonna clean it up.
yah it is
I totally would have spider-crawled the walls. Go all ninja warrior on that hallway.
awesomeME24 years ago
i like the idea of tying strings to a some of them that would be so frustrating.
Hrafnafloki4 years ago
you can also tie a string to the cups and hang tape them to the roof
i wouldent care walk walk walk walk hey maid ill pay you 5 dollars to clean this up
remember if your stupid enough to use dye or any thing that can stain odds are you will need to replace the entire carpet, rug, wood floor or the grout of the tiles
Only if you're caught ;)
Trilby hazode5 years ago
 Damn straight
fo shizzle my nizzle !
yankee2174 years ago
try playing beer pong with this!
im going to do this in the bathrooms at my summer camp, and the mess hall if i can get in
(removed by author or community request)
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