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Where the geezer tells the joke, laughing at the joke and then has to explain it for a long period to all who don't get it. This eventually causes it to not be funny.
Guy 1: Did you not get the joke?
Guy 2: Nah I didn't, but don't start that Bowkett humour again !
When you re-use the joke too many times, it causes it to become unfunny.
Guy 1: Haha that's what I did to your mum last night!
Guy 2: Dude that's just metro-standard, just stop..