Mine does this too. The only time this bothered me was when my cat would want to sit on my lap...just not a comfortable postion at that particular time. He is too fat for that now, but yeah. He sits and watches me. I think he knows what I am doing as he has also jumped in the tub, backed up to the drain and peed! I would say yuk...but I can clean it real easy and that's one less lump I have to spoon out of his litter box.