This is a post-shower game invented by me and my brother. Straight after our shower, we would do a 'peacock parade' to our parents (and sometimes other adult guests) who were sitting in the living room next door. The 'peacock' effect comes from taking your towel and sticking one corner firmly between your bum cheeks and squeezing tight. Then you walk around on your tippie-toes with your head held proudly back. After a couple of laps, you go back in your room and everyone is going 'ooh isn't that funny'.
Occasionally however, in an effort to avoid the towel slipping out (from the friction of the carpet), which it sometimes did, I would stick the towel up my bum a bit too far, so that the corner went a bit brown. Then my brother would go and tell Mum and it would ruin the whole game.