Entropy - the observation that the net dirtiness of an isolated system can only increase

Entropic death of the universe - everything is too dirty to clean anything else with

Also see: the cat in the hat comes back

That book has caused me inquantifiable anxiety about life

Who is Smith and why are you cleaning him with another Smith

All those poor scouring pads, will never be clean just keep getting more dirty every time cleaning the oven until thrown away

Actually it could be a big crunch given recent science.