For me: Falling down the grand stairs in the foyer in my company's home office...ending with my legs heading up the stairs and my skirt up by my face.

For my co-worker: When I spotted her walking down the office hallway with toilet paper coming out the back of her pants, trailing down the floor. OMG! (She's lucky it was me that spotted her first because I wouldn't tell anyone in the office...just my PT friends. )