Well, I have 2 cats and 1 dog, so someone is always harking-up something.
Cat vomit is always a lot of fun to step on at night in the dark! And somehow the cats are much better than the dog at making sure that it's always on our light colored area rugs, and NOT the wood floor or better yet the linolium! I don't think any of my cats have ever harked-up anywhere that it was easy to clean.