I'm shocked, but I think I know why it happened. (!Dirty Litter boxes) I've owned kitties for 2 1/2 years and never once had a prob. Today, by the two favorite litterboxs there was wet stuff. I wiped it up and it was light yellow, but didn't have a real strong odor. Hubby sniffed it and said he thought it was pee. My only concern is that it could be real liquid vomit, b/c Rocky hasn't been well lately, however he has been eating and I haven't found any um, chunky stuff. Should I be crazy concerned, or just practice better house keeping, which goes without saying anyway.BTW all kitties are fixed, 3 boys, one girl.