Well if it's the silly old games (i.e. Flight, Flight!....No Sir I'd be a Group Captain), then there's always this one:
Army corporal strolling down the main drag in Div HQ one day, and along comes a Flt Lt going the other way. "Morning Sir" (no salute) .
"You there! Don't you salute Flight Lieutenants in the Army?"
"No Sir, we don't have any".