During a concert by Frank Zappa and The Mothers of Invention at the Montreux Casino, an audience member fires a flare gun into the ceiling, causing a...

During a concert by Frank Zappa and The Mothers of Invention at the Montreux Casino, an audience member fires a flare gun into the ceiling, causing a fire that destroys the venue. The incident served as the inspiration for Deep Purple's 1973 song Smoke on the Water.