When people show up at the ER complaining about stomach pains, chances are they didn’t swallow anything dangerous. Then there’s that 10% of patients who definitely put something inside themselves that they should not have. The crazy things doctors have found inside people can range from a knife to literal living creatures. So, the next time you’re complaining about a tummy ache, remind yourself about the crazy things doctors have found inside people—and then rush to the ER, because you could be about to give birth to a litter of kittens. Literally.