This is fun, well, at least when your bored, especially during Christmas holidays. Flatoo is a small and free app designed by a German developer. Just run the app, put your phone in your pocket, lift your leg, and.. fart away. Wait a second, lift your leg again to fart on. Hilarious!
You will have to be some kind of slapstick comedian of course to use this app in the shopping mall, as the description on Play Store says, but Flatoo could be fun when choosing the right place where to play with it. Check the Play Store for yourself!