Senior prank season is upon us and an as-yet-unidentified senior at a school in a Chicago suburb has kicked things off in style. According to a BroBible tipster, this person stole stationery and envelopes from the school, Saint Viator, and sent out a formal letter to all senior parents telling them that there will be "mandatory body cavity searches" at prom for contraband. Needless to say, the letter was so well done that everyone's parents flipped out and have flooded the school with hundreds of outraged phone calls and emails. The senior who pulled off this work of genius has still not been identified. Check out the letter after the jump.