maybe you ticked him off, lol, thats true though, cats are smart (well to an extent :) ) if you make them mad for some reason they use your bed or your pillow and just urinate or poop on it to get revenge on you. I had a siamese do that to my bed after we had him neutered and declawed... he was ticked. but he only did that to me once.... he pooped on my daughters pillow every time she would make him mad...... LOL.