Usury
One of the few things that some religions have got right is condemning usury. I am appalled that ads like the one below (the link obviously doesn't go to the company in question) are legal. I'm even more appalled, of course, that there are people stupid enough to take them.

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Fuck me with a pineapple! Or rather, fuck the idiots who take those loans with a pineaple, cos that's what they're going to get.