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...