Inspired by what I (and many others) thought this question would be about:
What happens to all the half-used (or more likely 5% used) soaps in hotel bathrooms?
You check into a hotel. You open a soap that's big enough to last you a fortnight. But you're only staying for two nights. What happens to it when you're gone?
Is it simply binned? Do the maids (and other staff?) take it home and never have to buy their own soap? Or is it recycled, melted down with all the other leftovers and used to create new ones? ("Melted" is almost certainly the wrong word, but "dissolved" sounded boring. And I don't make soap so I don't know if neither word is correct.) Is the International Maids Union secretly hoarding them all with the plan of one day unleashing them on tiled hotel corridors and making all the guests slip over?
(I'm almost certain they just get binned. But that's less fun than the alternatives.)