THE COMMAND FART:
This fart differs from the Anticipated Fart in that it can be held for long periods of time waiting for the right moment. Unlike the Anticipated Fart, it is intended to be noticed. Peter Billingham is reported to have held a Command Fart for the whole period in a history class and let it go right at the end when the teacher asked if there were any questions.

I'm sat here laughing like a crazy man...geeez