"Why is everybody so serious?
Acting so damn mysterious"
I love this! It conjures up an image of a crowd of people wearing trench coats with collars pulled up and hats pulled down over their eyes, a sort of Inspector Gadget flashmob. It reminds me of H G Wells playing charades, drifting around in a sheet and then saying he was ‘God moving in a mysterious way’. If you emphasise the 'm' and stretch the second syllable, there’s something inherently amusing about the word, but why?