I was alone in the house last night, just me and the dogs and the hedgehog. I decide to take a shower before bedtime, and because I am feeling pretty cheerful, I start singing "Mack the Knife."
You know: O the shark has pretty teeth dear, and he keeps them shining white. Just a jack-knife has MacHeath dear, and he keeps it by his side...
...in the shower. If that's not setting yourself up for a certain scene from Psycho, what is?