So in the Star Wars D6 campaign Rebellion adventure Scavengers, Lee's character Hack mouths off to the guards and one hits him with the butt of his blaster rifle, which is a buttstroke, but no one else knew that, so for the rest of the night, it was all sexual innuendo such as:
Mike "He buttstrokes you, running his hand down the curve of your butt"

Ever since then, Mike tries to work a 'buttstroke' comment into almost every game session…