Laird hooks up with his hot but crazy ex-wife, Joannifer, who disrupts all of the carpoolers' lives. Meanwhile, Dougie and Cindy decide to renew their wedding vows to wipe out the memory of their catastrophic first wedding ceremony.

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.

Laird is infatuated with the sexual harassment seminar leader, Dorrit. To guarantee time alone with her, he claims he's being sexually harassed by the women in his office. Meanwhile Leila enlists Marmaduke's sign spinning skills to promote her real estate business, but he has to out-spin the competitors on the same street corner.