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Kenny took the weights out of his vest after the initial weighing.
4th Jan 2008 / Season 4 Episode 09
The guys wore weight vests to see who could carry an extra 80 lbs. the longest. Kenny ordered a high-tech, padded weight vest on the show's budget while Spenny used a regular vest with barbells and other weights tied to it. Kenny took the weights out of his vest after the initial weighing. He then donned makeup and a fat suit and left the house. Upon returning, Spenny noticed that Kenny had a whole right index finger (Kenny lost the tip of it in a bicycle accident when he was younger) and deduced that this was a decoy. Spenny heard noises from Kenny's room upstairs and used a lipstick camera and saw Kenny still in his room without his weights on, so he took his own weights off knowing that Kenny had lost. Spenny ultimately discovered that the decoy downstairs was Kenny all along and was wearing a fake finger. The man in Kenny's room was actually a make-up artist wearing a mould of Kenny's face.
Melvin
Endurance competitions entail lasting longer than the other guy. They include competitions when the other guy might get caught or break a rule first, as they didn't endure longer.