Urban legend I heard during my time at XJT was that a FA can'd both engines in flight. She was hanging onto the fire levers when they hit some rough air and fell forward. That must have been a fun flight for those few long seconds until they threw the handles back into place!
When I was still a bright eye'd bushy tail newhire I rode a mainline A320 JS. The crew was super nice and offered one of their meals. After finishing, I couldn't find a place to sit the tray so I decided to lay it on my jepp case. Well I forgot it was there until touchdown. At that point the entire tray, dishes and all, went flying across the cockpit making a horrendous noise.