These feline habits look innocent until something crashes, breaks, or bleeds.

Cats are sneaky little thrill-seekers. They pretend to nap for eighteen hours a day, then wake up ready to gamble with their lives and your security deposit. Some of their favorite hobbies come with an actual risk factor, even if they act like it’s all very casual. Here are twelve normal-seeming things cats do that can go very wrong, very fast—and why a few of them could cost you a lot more than a broken lamp.