Kenny vs. Spenny (2003)

S04E02 Who Can Blow the Biggest Fart?

Armed with gas masks the crew is forced to record perhaps the smelliest competition to date. Kenny, the fart-maestro, is shocked to find out that Spenny's gas-inducing diet is making him competitive. So, Kenny must dig deep to into his bag of tricks (and bowels) in order to win this methane-filled contest.