Smash Mouth's surf-garage rock sound infiltrated the 90's with songs like "All Star," "Walkin' On The Sun" and "I'm A Believer." This weekend, thousands of people gathered to catch a smashing performance from the band at the Taste of Fort Collins street festival in Fort Collins, Colorado and instead caught a bunch of mouth. With loaves of bread given to the festival's attendees as party favors, some of those party favors ended up thrown at the stage. This is when frontman Steve Harwell mouthed back, launching into a expletive rant where he threatened to go into the audience and beat up a fan as he was restrained by security members before the set was ultimately canceled. Watch the whole thing play out above.