10. Wiping his bottom. 9. Picking his nose and eating it. 8. Going back into the toilet to see if it still smells. 7. Buying a pornographic magazine. 6. Having a farting competition. 5. Pretending to be a spastic for a joke. 4. Sniffing the back of his fingers after scratching his balls. 3. Treading in dog mess. 2. Shaving his genitals. 1. Stripping off, pulling his arse cheeks apart, and pushing them up against the window of a Christian bookshop.