Liar's Poker - S4.E18

A call from an old college classmate whom Dave despised reveals a long-hidden truth about Dave and Beth's dating history. When Dave, Beth, Kenny and Shel engage in their usual game of poker, the art of bluffing becomes more personal than usual. During the course of the poker game, Dave discovers that Beth, Kenny and Shel have been sharing a secret since their college days about a past fling Beth had with an old college flame. Feeling slightly betrayed, Dave ends up pulling off the ultimate bluff.