It's deconstructive comedy.
I lost all respect for Richard Herring when I saw him live a few years ago and he got annoyed at people shouting out Fist of Fun/TMWRNJ catchphrases, telling them how that was years ago and that he'd moved on, and then proceeded to rehash a sketch from the Lee and Herring radio show later in his routine.
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Wed 18 May 2011, 15:18,
archived)