The old cup prank never seems to die. It involves carefully placing half-filled cups of water over an entire area making it impassable and a major pain to clean up. This time of year, students all over the country are pulling this prank on their schools, and their roommates. It's one of the best student pranks ever, unless you are a janitor. Not sure where this one happened, but apparently it was a high school.
Said to be done at a high school. Unknown school.