I've been in the gym for 25 years and right off hand I can't think of much. The funniest story I've heard was here on MuscleChemistry.com. Someone here said they were on a lat pulldown machine, I think, and some punk came in like he owned the place, put his big ass bag down on the seat of the lat pulldown machine and started "stretching" or some such. They said they looked at him for a moment to see if he'd move the bag...then picked it up and threw it across the gym!
I read that years ago and I still think about it all the time and laugh like hell! But, I can't remember who posted it. Hopefully they are still here.