Signs that he is not 'the one'

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On the first date when he asks what's your favourite part of your job, (good question) he hears your reply then says "well that's a waste of time isn't it"

At the sight of a simple silk scarf he says (in a panicky tone) "You're not putting anything up my arse"

When given the choice of sci fi and foreign language film he chooses the subtitles!

When watching Lost for the first time, he whines on about the laws of physics and how the plane engine couldn't possibly still be running - again and again and again.