Toot. Pass gas. Break wind. Cut the cheese. Float an air biscuit. Burp from behind. Blow the brown horn. The backfire, bant, bucksnort, booty bomb, colon cologne, drifter, fanny bubble, gasser, gurgler, moon beam, nether belch, pants puffer, pooh tune, rip-snort, sphincter whistle, thunder dumpling, tush tickler, and trouser cough. These are synonyms for a bodily function that is as natural as breathing, eating, or sleeping. Yet unlike other physiological functions, the ‘flatus’ is a source of endless humor – perhaps more so than any other subject in human experience.