Slither (1973 film)

Slither is a 1973 comedy film starring James Caan. It was directed by Howard Zieff.

Car thief Dick Kanipsia gets a parole from a penitentiary. He intends to go straight, but first he goes directly to see an old friend, Harry Moss, only to be shocked to see Harry get shot. Harrys dying words tell Dick to go find Barry Fenaka, a guy who supposedly knows where to find a stash of stolen cash that Harry has hidden. Instead of dying slowly, Harry blows himself up with dynamite. As Dick flees the scene, a black van lurks in the trees.Dick hitches a ride with Kitty Kopetzky, who starts out as a friendly free spirit, then turns into a nut case who robs a diner where she and Dick go to eat. Dick flees during her robbery and catches a passing bus. ........

Source: Wikipedia