School Pranks (Tear, Nostalgia)

I broke in, turned whole rooms upside down, and filled the library to the cieling with chairs. RSC dropped thousands of ping pong balls on the school yard at lunch from a helicopter. Flippish's crew is rumored to have fed bessie some laxatives and walked her up to the fourth floor of the school building.

These kids? They took to the streets, and took to the streets, and too...well you get the idea.

Hint 1: There is a tunnel under the buildings.
Hint 2: There were 94 of them.
Hint 3: There is a chicken and a cow.