you're no fun anymore

The name of episode 7 (first season, airdate 11/30/69) of Monty Python's Flying Circus, this phrase appears throughout the episode but most notably at the end of the "Camel spotting" sketch. This very bizarre episode is also the source of the blancmanges playing tennis and turning into a Scotsman references. On channel, it is used when someone is being a poor sport, or when a session of bonmotoring runs into a dead end.