TheBigLebowski wrote Get 2 chickens and write on them "#1" and "#3". Then let them loose in the school. Once they find the 2 chickens, they will spend hours searching for the "#2", but there is none, haha.

That would be the BEST prank ever!

On my schools last day the older ones sat outside the school with water guns and soaked everyone in the morning before they got into school and set off fireworks.

And at night they went in a graffiti'd all over the wall and took a dump in the principal's office.

PUT A COW ON THE ELEVATOR PUT IT UP STAIRS HIDE ALL THE ELEVATOR KEYS....CAUSE COWS CAN'T WALK DOWN STEPS

Boundless wrote On my schools last day the older ones sat outside the school with water guns and soaked everyone in the morning before they got into school and set off fireworks.

And at night they went in a graffiti'd all over the wall and took a dump in the principal's office.

I feel like that went a little to far after the graffiti..

They coulda just stopped at soaking everyone in the morning

lol

Gather a few friends , get a few sharpies and about 100 plastic cups ( the small white disposable ones )
Go into your science room and right chemical compounds onto the cups , and fill them with water and different food colourings .
People would be worried to touch them.

Saran Wrap the toilets all toilets, Stink bombs is a plus, Like 20 box's with 3 in each box.

Get 4 baby pigs put signs on them saying #1 #2 #3 #5 and do not put a sign #4 on one and run them loose through the school

Kind of a smaller prank that we did last year before the real prank was two people brought in Sock em Boppers. ( Look them up if you dont know them). We got a large amount of people to crowd the main hallway and had the two people start "fighting" in the hallway. All 4 deans got to the "fight" at the same time. The facial expressions were priceless lmao.

That was just a distraction for the actual prank though lol. We made them believe thats all we were gonna do.

I love the chicken idea but you won't do that so I suggest you somehow put caution wet floor signs everywhere and squirt water all over the floor ... It's random and they will be like Da Fuq

In my school one year the seniors bought tons of s3x dolls and put them in the halls

And they also dressed up as a chicken and a wolf and ran round the school scaring the shit out of everyone by runing into class and tipping tables etc it was funny