Backseat Rubik's-Cubing
When someone trying to solve a Rubik's Cube gets bombarded by others that are trying to tell them how to solve it. Backseat Rubik's-Cubing tends to happen at AcDec competitions while waiting endlessly in the lobby.
It was hilarious watching Grey and Brandon Backseat Rubik's-Cubing Busby while waiting in the lobby before the AcDec competition.