The Gumball Rally (1976)

Director: Charles Bail
Cast: Gary Busey, Harvey Jason, John Durren, Michael Sarrazin, Norman Burton, Steven Keats, Susan Flannery, Tim McIntire

Synopsis:

A group of people from different backgrounds have one thing in common: when they hear the world “gumball” whispered by one of the others, they know that it’s time for the Gumball Rally: a no-holds barred, secret, winner-take-all rally across the USA.