Greg's big day is his birthday. Kim wants to take him and the kids to Disneyland, but Jimmy talks Greg into going out and partying like he did when he was single. Greg begins to wonder if he made the right decision after he goes cruising with Jimmy's aging frat boy friends, Chuck, Steve and Gino. While trying -- and failing -- to get into a cliquey club, Greg, Jimmy and company run into Bret Michaels from Poison. Jimmy introduces himself to Bret, and soon everybody is invited to a wild party Bret's having. Greg, out of his element, is surprised to learn that the real Bret Michaels lives the same kind of family life that Greg does, and is merely hosting the party for some of his friends who are in town. At Bret's urging, Greg returns home, realizing that the only place he should be spending his birthday is with his family.

The Warners have a problem when Sam develops some aggressive behavior with other playground children. A humiliated Kim points the finger at Greg, but Greg laughs it off and thinks Kim should just let Sam grow out of it. Greg changes his tune after he has to suffer the humiliation when Sam chokes another toddler at the park. So it's off to the library to do some research on how to cure the problem. Jimmy intervenes with his usual against-the-book advice by telling Greg what he did when Dominic became violent -- he found a bigger bully kid to knock some sense into him. Only after Greg pictures Older Sam going crazy and attacking a classmate does he put the books down and agree to do it Jimmy's way. With Kim and Christine off to a baby shower, Jimmy finds a guy with a troublemaking two-year-old who's bigger than Sam, and the fight is on. Marvin, the guy, arrives with his hefty son, Todd, just as Billy and Steve drop by Greg's backyard to see the ""match"" in person. They're not the only one