From The Fart Dictionary

I had to chuckle when I read this:

CROP DUSTING: When farting, you walk really fast around the office so the smell is not in your area and everyone else gets a whiff but doesn't know where it came from.
Be careful when you do this. Do not stop until the full fart has been expelled. Walk an extra 30 feet to make sure the smell has left your pants.

Here are some more.