On the film Mr and Mrs Smith and why it is, in the main, not funny.

A funny thing about the film Mr and Mrs Smith:
'The Tank' (geeky guy that everyone is trying to assasinate) is wearing a fight club T-shirt in the scene where Brad Pitt (aka Mr Smith) is interrogating him in the hotel room.

Other things about the film Mr and Mrs Smith:
I'm not sure I feel entirely comfortable with the fighting-as-foreplay theme throughout the film and most especially when Mr and Mrs Smith are actively trying to kill each other, but then suddenly stop that and shag each others brains out instead.

"Hey, sorry about nearly breaking your arm."
"That's OK, Hon, grab my tit. I love you".