Farting is illegal
It is potentially illegal to fart on a woman in Sweden. According to the woman, after denying sex to a man that she brought home to her apartment, he broke wind in retaliation for her wasting his time. For "disturbing [her] peace of mind," she reported him to the police, who dropped the case due to their inability to prove intent.
In Austria, a young man was fined 5oo Euros and arrested after farting the in presence of a couple of officers. They stopped to check his identity and claimed that he, with intent, proceeded to blast his ass trumpet directly at them, filling the air with some kind of malodorous essence that they felt constituted obstruction.
The 2011 Malawian Air Fouling Legislation would have made public flatulence illegal. Anyone who vitiated the air with some kind of noxious substance making it difficult for people to go on about their business would be guilty of misdemeanor. The bill contained additional clauses, but these aren't as important as the aforesaid.
In Florida, it is illegal to fart in a public place on a Thursday after 6 pm.