Joke Killer

Someone who overuses a joke so horribly that not only does it make entirely unfunny it also annoys everybody. Or someone who steals a joke and uses it so often it ruins the joke to the annoyance of the creator, sometimes causing violent outbursts.

Hear the one about the chicken crossing the road? "Who hasn't? The joke killer has been using that one 100 times a day for the past month!"