Laird pretends to be married to impress a girl who's into married men, Dougie believes Aubrey is having an affair when he sees him sneaking into a motel, and Marmaduke suspects that Laird is his father.

When, in a playful attempt to spice up his marriage, Gracen asks Leila whom she fantasizes about sleeping with, she answers "Laird," which creates an issue between Gracen and his best friend.

The guys feel guilty but swear secrecy when they believe that a prank they pulled caused a rival carpool's car to catch fire. Meanwhile, Marmaduke's latest money making venture, an ATM machine that levies an $8.00 service charge, is cut short after being vandalized by unsatisfied customers.

Aubrey invites the carpoolers to his daughter's piano recital and Dougie accepts for a reluctant Gracen and Laird, which causes the group to examine their friendship. Meanwhile, with Marmaduke's visualization coaching, a determined Gracen trains heavily to finally beat wife Leila in an annual charity run.