Once we pulled out our luggage & dork dots on a Wednesday & went to dinner pretending that we arrived that morning and were wandering around lost all day. We had a couple of guys really going.
We also had a giant pyramid stack of empty soda cans in our room on top of the heater. By the time left it was so huge that there were 20+ cans on the top row at the ceiling. We'd have missionaries that we didn't even know but had heard about us dropping off their empties when they left the MTC.
Towards the end, we had to guard it because our "rival district" kept threatening to knock it over. We kept our door closed at night and wouldn't let those guys in. One night they went outside, kicked open our window (we were on the ground floor), and threw their bottles of vitamin pills through the window & knocked it over. They went to their room and locked the door. We kicked open their window & dumped all of their pills + our pills onto their floor.
Later that night their branch president did a surprise room inspection. He knocked on the door but, thinking it was us, they didn't open. Finally they shouted "get out of here or we'll make you eat every single one of these!". The BP wasn't too amused by that.