Patient - their own vomit. They ate so fast they puked then just kept re-eating it. Had to be dragged away. Mentioned this in a VtM group that thought they were edgy. They were like "well you can't eat anything that's not blood or you'll puke it up" and I was like "but I can just keep re-eating the puke right?" You could hear a pin drop in that chat.

Also lots of weird day-old congealed milk in juice mixers. See that one a lot actually. They scream at you for clearing out their room but you have to do it to keep them from poisoning themselves or getting weird infections.