Today, some people let out hundreds of mice in school so we were under lockdown all day. The problem is that some of the mice were already dead so the other starving mice started eating them. There were over 50 dead mice and blood around... and they spray-painted the mice orange and black, the school colors.
i remember my school prank. We let out 3 pigs and spray painted them 1,2,4. They principal found the three but kept screaming, "where the hell is 3?" It took all day until he figured out we fooled him. It was safe and not that gross.
See, my idea, instead of mice, would have been crickets.
Get 3-4 big boxes of crickets from some pet stores, and then have some people simultaneously flip the boxes over in a few locations. One outside, one in the main lobby, the gym, etc...