Her Turn

There was a husband and his wife sitting next to a drunk in a bar. Suddenly the drunk stands up and yells, "ATTENTION ALL" and farts loudly. The wife is extremely embarrassed, and the husband looks at the drunk and says, "Excuse me, you just farted in front of my wife." The drunk replies, "I'm sorry, I didn't know it was her turn."

Found at
http://your-joking.atspace.co.uk/