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I wasn't part of it, but I remember people letting off stinkbombs, spiking the water with laxatives, and egging the deputy head teacher.
 
I was too anxious and uptight as a high school student to pull any pranks of my own. As I recall one group of guys released a bunch of sucker fish into the school's pool. They didn't last too long in the warm, chlorinated water, and by the time they were discovered the school was filled with a rather pungent odor.
 
i admit participation in no part of this, however our senior year prank is still one of the most cruel and hilarious pranks ever (class of 2003)

we bought several chum blocks (if you don't know what chum blocks are, they are frozen blocks of fish blood, guts, etc. that fisherman drop in the water to slowly defrost the fishy blood & guts smell to attract bigger fish to the boat)

anyway -- we took many chum blocks and placed them strategically in lockers (our lockers were in the classrooms) and locked the lockers... there were also some placed in the ceilings (just stand on a desk and move the little square segment over, insert chum block, and replace ceiling tile)

we spread them out everywhere. after a day or so, they melted all throughout the lockers and ceiling onto students at their desks below, and all over the carpet and everything. the clasrooms were shut down and the classes had to be taught in the gym for several days. kids were going home sick because the smell was so awful

the smell stayed for weeks (but that's cool cuz seniors got out 3 weeks early!!)

long live the class of 2003
 
That's not a prank that's a health hazard.

Pranks do not damage property nor get people sick.
 
Wow..

Class of 1990: took everything out of the Principal's office, including the light fixture, and put it all upside down; desk, chair, etc. was on the ceiling, lights were on the floor. Only thing that wasn't on switched was the light switch.

Class of 1991: Guy and a girl streaked (yes, naked) through the entire school on a Harley during lunch period. My school was/is 3 stories. bloody bike was so loud it almost cracked the lens in the school's planetarium.

My class (1992): took apart a 1971 Volkswagen bug (incidentally, 1971 was the year the school opened), and reassembled it in the class library with an automatic starter to turn on the car at 7:30am. The auto shop class took their time in taking it apart. ;)

For me personally, there is a week that my school has called Senior Slob week. We can pretty much dress like slobs with shirts from late night cramming, fast food stains on them, stubble, messed up hair, etc. So I woke up, put on some shorts and a shirt, my bathrobe, and some of those huge bear claw slippers (actually, mine were Goofy), and went to school. Everyone thought I had on nothing and got called into the principal's office for it. They saw I was wearing a shirt and shorts, and sent me on my way. The rest of the students didn't. Eventually, someone tried to upstage me by coming in a bathtowel the following day, and the poor girl didn't have anything on underneath...

You know what happened next.

BL.
 
One of ours was on college humor. I can't find the picture anymore though. But some people stole the blow up Shrek that was on top of the Burger King in town and put it on the roof with '04 written on each hand. Another was having everyone buy those cheap $1 stopwatches, and set them in the lockers to go off at the same time. That was hillarious! Very angry staff.
 
Oh, so long ago...I can't really remember.

My graduation year involved physically moving the Principal's car (a compact) into the fire zone, and having it subsequently towed. There were also various instances of creative geography for urination - but that's more a badge of idiocy.

Of more note, I went to the same HS as the late Chris Farley of SNL (he graduated 5 years ahead of me, so we didn't share the halls). He rigged the Commons/Cafeteria Soda machine to have one tap of beer instead of soda. It managed to last about 30 minutes, which isn't bad considering HS students.
 
I don't think my senior class in high school even thought to pull off a prank. We just wanted to get out of there. When one of my younger brothers was a senior, his class filled the principal's office with enough glass marbles so they were several inches deep and started rolling out into the anteroom when he opened the door that morning...
 
1981 - crickets and Catfish Charlie. CC is a very poor smelling, gooey fish bait. We were being monitored by the police, so not a lot was accomplished. We had actually done it a few times already during the year, so it wouldn't have been anything new.

Some of the guys were frustrated so they outwaited the cops. They then broke in the library and pushed over the bookshelves. That's destructive, not funny. They almost didn't graduate.
 
My school really didnt allow for one to occur. I know most schools do that but ours actually had security guards patrolling the campus at night so no one could do anything. Yet, just last year (3 years after I left) someone was able to do something and they almost got expelled.
 
Not me, but another student put in a classified claiming the various school offices were for rent -- the principal's phone number being the contact.

Years and years ago.
 
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