Mattie Demaret (Barry Pepper) should be the heir to a Mafia kingdom, but ever since he was branded a sissy at age 12 for refusing to shoot at point-blank range the man who sent his father to prison he's been an errand boy. So he sets out to prove himself to his pop, Benny Chains (Dennis Hopper), and his uncle, Teddy Deserve (John Malkovich), by arranging to transport a sack of cash across the country. He counts on his friend Marbles (Seth Green) to get it there intact, but unfortunately the coke-sniffing pilot and general screw-up sniffs some coke and, well, screws up, losing the cash somewhere in Montana. Mattie heads out to Big Sky country to save the day, bringing along two more friends: Taylor (Vin Diesel) provides the muscle; Tony (Andrew Davoli) provides the charm and good looks. As the foursome scrambles to reclaim the cash from the crooked sheriff of Wibaux, Mont., they discover talents and strengths they never knew they had. When the focus is on the caper and the pace is quick, Knockaround Guys has a youthful exuberance that's fun to watch, but when things slow down to give the boys a chance to moan about how tough it is growing up Mafia and working as errand boys to their high-ranking daddies, the audience takes a real pounding.