In 8th grade, when everybody took Home Economics and Shop, I figured out a needle, threaded with a short length of thread, would fall point down. At the end of the day, when the stair well was chockablock with people, I’d drop a couple of needles over the 2nd floor rail and listen for the yelps of alarm in the crowd below.
I wasn’t much of a prankster, but I did get in a couple of shots. One was to get back at my sister because she didn’t want me drinking the pop she claimed to be solely hers with warnings not to touch it. When she wasn’t home I took one of the cans out of the six-pack and, using a very small nail and a small hammer, I gently pierced a hole in the top of the can. Next I got a hold of a large syringe and needle and extracted the contents of the can. After the can was empty of soda I filled it back up with water. I then put the can back into the pack. Sure enough, my sister opened the can and began to drink the water, expecting the taste and carbonation of the soda. It really freaked her out and she thought the drink had been poisoned. When I 'fessed up she was very pissed off, to say the least.
This other incident had no motive, so it was true mischief. In the eighth grade after school we’d walk home from the bus stop through an alley. Along the way was a store with a large tin roof. There were lots of small rocks, about an inch in diameter, in the alley. One day I threw one of them and as it hit the roof it bounced LOUDLY down the slope. We kept this up for a couple more days until one of the people came running after us. We ran like hell to get away from him and we never did it again. It was fun while it lasted.
Recently: find the most anal retentive colleague can. Procede to alter their interent homepage to extreme pr0n, follow this by cracking the internal network and doing same to sysadmin (who could not admin a tin can and string network). Place various hidden pr0n files and executables on their systems. Alter name of said files and executables so innocuous counding things like “MS Word”, “Calculator” etc.
Sit back smiling
Mom?
Hey Yersinia, how YOU doin’?
I used to have a co-worker friend I used to pull pranks on which included:
switch around the drawers of her desk
put a piece of tape over the little plastic thing on the telephone so when she answered it it still rang.
put olive oil on the earpiece of her telephone
unscrewed the handles of her desk… so when she went to open them the handle popped off
changed the wall calender to read the next month… she didn’t notice for 3 weeks
take out all the ink from her pens… which I did in turn with…
take out all the lead from the mechanical pencils
unscrew the back of her office chair so it fell off when she sat in it the next morning.
wrote a name or place on her calender which left her wondering what the appointment was for… she went to 3 bogus appointments that I know of. (her handwriting and mine are similar… which helped pull this off)
There was more… but those were the good ones.
Things I like to do to the WHOLE office is:
take the dialup account offline at 6pm and come in late the next morning. Hopefully by next month I’ll get them to give us DSL. 
tape up the ink jets in the printers.
unplug the monitors
email very large nonsensical spreadsheets to unsuspecting coworkers who don’t know how do work spreadsheets… but won’t admit their ignorance
turn the thermostat down in winter… up in summer
turn their screen resolution up or down depending on my mood…
uuummmm… that’s all I can think of at the moment.
A friend and I were about 16. We were walking around in our small town about midnight in the summertime. As we walked by a house, we noticed though an open screen door that a woman was standing by her TV…naked. We went in for a closer look. We found a window behind the couch they were sitting on and looked inside. My friend could see the woman. I could see the naked man with her on the couch. I was not interested in ogling said man. We were about a foot behind them, and the window was open. I silently motioned my friend to switch places. He shook his head no. I motioned again. Another negative shake. My reaction? A loud scream. I’ll never forget the look of horror on my friends face as the counter-screaming and shouting began in the house. Since both occupants were naked, we had time to make our escape before they came bursting out of the house to find us. It’s very hard to run when you are laughing so hard you can barely breathe.
In one of the university computer labs, I inadvertently leaned back against the wall and hit the light switch with my backpack, plunging the room into dimness. After the chorus of panicked yelps from the folks at nearly every terminal in the room, I made it a point to turn the lights off every time I entered a computer lab, after that. You’d think someone would have noticed the “power outage” didn’t affect the computer monitors… But nope, at least a dozen people always squawked about losing their work.
heh, I done loads of the ones relating to puters or phones when I worked in offices. I used to take fuses out of random things too.
I used to “shotgun” peoples beer - pierce a hole in the side of it with my teeth, bring all the beer, then put it back in the plastic thing that connects all the cans together. That was amusing when people opened the can and it was empty - sadly it got me too pished to enjoy it for long.
My latest trick is putting small balls of Flash-Paper in ashtrays - very funny when someone puts their ciggy out and it explodes into a fireball instead!
Yep, you’re right. Same as you “bleed” a radiator in your house.
oooooh, I have so many evil ideas from this thread now!