I went into DS's room earlier as I had some clean clothes for him. He had his mate in there and the room was a tip so I said to him "I hope you're going to clean this mess up?" and he just went nuts, started making oink noises (I assume in reference to the pig sty) and crawling around on the floor before stuffing his pillow into his mouth and slapping himself across the face so I just said "okaaaay" and walked out.
His mate was in absolute hysterics and I heard him say "why did you do that?" and DS replied "to get rid of her, she hates wierd behaviour"