5x18 - Cheers

For the bachelor party the guys at the bar throw for Sam, Woody offhandedly asks Diane if she would be the girl who jumps out of the cake. Although she abhors such male sexual rituals, she agrees if only to stop someone else from "pleasuring" Sam. At the party, just as Diane is ready to come out of the cake, Norm makes a comment which makes Sam re examine out loud for the first time this wedding and the fact that Diane will now be the one and only woman in his life. After jumping out of the cake mad at Sam for his comments, Diane later offers Sam a proposition: she will give him a last 24-hours of freedom to do whatever he pleases with whomever he pleases. Sam excitedly agrees until Diane throws in that she too will have her last 24-hours of freedom to do whatever she pleases with whomever she pleases. Will Sam still go along with Diane's plan and if so what will he do and what will she do?