I'm not sure if it's a lack of self-awareness or simply plain idiocy, but whenever I hear people quote one-liners from their favourite film/tv sketch etc, I cringe.
Don't these people realise just how stupid they sound by trying to imitate someone else's gags?
What might sound funny on screen generally sounds absolutely awful in real life, especially if you recognise the exact quote in question.
At my workplace the other day I overheard 2 colleagues giggling uncontrollably whilst re-enacting a scene from Holy Grail, whereby one of them kept repeating, 'no it isn't, it's only a scratch', to much laughter and delight from the simpletons working nearby.
When they asked why I wasn't laughing, I simply shook my head, rolled my eyes and groaned.
I've come to the conclusion that people who quote films/sketches are indeed the lamest of the lame. That is all.