Party animal Tommy Callahan is definitely a few cans short of a six-pack. But after seven years, Tommy's finally earned his diploma -- and a cushy job at Callahan Auto Parts. Returning home, Tommy gets some more great news: his dad is marrying a real "10," and Tommy will get the stepbrother he always wanted. But as fast as you can say "Who killed the keg?," the family business starts tanking. Now Tommy's got to hit the road with his dad's right-hand...