You want to begin planning days in advance, to allow time to assess routes and prank-points.
Step 1: Determine Your Targets.
Ideally, you want to have a few hours when they aren't going to be around, like early in the morning before they wake up, or before they get to work. Try to keep a range of 3-5 people and plan your time accordingly.
For my own operations, I'm sticking with my sister, dad and mom.
Mom's awake around 7 Am, Dad is supposed to be up to get to work, but anyway. I'm planning my prank placement for around 5 Am, although I may adjust to 2-3 Am depending on conditions.
Step 2: Begin Surveillance
What time are they up?
What is their first stop, what room and what order are their activities?
Second room, same and so on.
Is their a point where they encounter another target in the same space? If so, mark it.
An organizer might be a good choice.
Check which day A1 will be on, and pay close attention to each time you hit that day of the week.
Any changes? Is their something that might change the routine on A1?
These are important!
Step 3: Locate Prank-points
Try to work out chains, they get something on them, so they go to the sink and get sprayed, etc.
Try to allow for long term pranks, spiking ice cubes and the like. Avoid destroying anything, full jugs, etc.
Try to prank objects that the people will use, shower, toilet, sink, doors, computers.
If you do destroy something, have intact spares nearby, so as not to adversely affect someones getting ready to go to work.
I'm not going to come up with the pranks for you, look on the site, or use your imagination, crazy idea.
Step 4: Case the Joint
You will want to look at each room one at a time,
What am I pranking?
Is there something that will effect me getting back out?
(Pranks involving closed doors. Have an alternate route!)
Is there an order I should go around the room?
What supplies will I need?
Do I need to prepare anything ahead of time?
What order should I do the rooms?
Any danger zones?
How will I avoid them?
What's my alibi for being in this room after hours?
What's my emergency escape route?
Where's my dark corner to hide in?
Step 5: Place Your Caches
Rather then carry it all that night, stock it near where it's getting used.
Try to do this the day before you strike. Hide it in shelves, behind doors, just make sure you wont make noise getting to it.
Step 6: The Day Before
That night, offer to turn off computers, put away things, whatever you need to prank.
Trying to deal with computers during the main operation is a bad choice, have a flash drive ready with whatever you are putting on.
Have dark clothing on at bed, and be ready. Figure out what time you should get moving, it should ideally be dark or before people would be there.
Step 7: A1 Day
Have your dark clothes on, and wear socks.
Take each step one at a time, complete the prank, move on to the next one, saving door related pranks for last. Be ready at any moment with your room specific alibi, and keep a listen for movement.
Try to start with the closest and or easiest pranks and rooms first, if you have to abort you'll at least gotten something done.
If someone wakes up or is coming:
LOOK- Where are they?
EVADE- Can you get to a different room?
DUMP- Lose whatever equipment you have, unless it's part of your alibi.
COVER- If you are in a dark corner and have time, duck and cover, sit with your knees near yourears, head down, arms wrapped around your legs. Pretend that you are a box, or for MGS fans, doyou have a box to hide in? If you choose this route, do try to be in the corner. A box in the middle ofthe floor isn't going to work. If you don't or the light goes on switch to your alibi, getting a drink,
heard a noise, have something ready.
Try to avoid flashlights, or if you use them, have something between the light and any doors, and NO lights in rooms with people. A red filter could also make a difference.
When your done, head back to bed/wherever and await the glory of your hard work!
Step 8: Sit Back and Enjoy
You do want to own up at some point, or else why bother doing this?
You could also have a note at the end of each person's prank chain with a VA1 day message, styled after WWII posters (i.e. V Day) It's up to you want you want, since it's your operation.
Congrats! With any luck you've pranked a group of people excellently.
I'm going to be using this come A1 Day myself, so I'll let you know how things go. I want to hear your stories as well, so send 'em in!
(Note: Looking at my targets since I started writing this, something came to light. Mom appears to have a phobia of all things for pranks. Who knew? You might want to keep odd things like that in mind. This should be fun, remember.)
Step 9: Credit