During a concert by <a href="https://en.wikipedia.org/wiki/Frank_Zappa" id="mwAUE" rel="mw:WikiLink" title="Frank Zappa">Frank Zappa</a> and <a href="https://en.wikipedia.org/wiki/The_Mothers_of_Invention" id="mwAUI" rel="mw:WikiLink" title="The Mothers of Invention">The Mothers of Invention</a> at the <a href="https://en.wikipedia.org/wiki/Montreux_Casino" id="mwAUM" rel="mw:WikiLink" title="Montreux Casino">Montreux Casino</a>, an audience member fires a <a href="https://en.wikipedia.org/wiki/Flare_gun" id="mwAUQ" rel="mw:WikiLink" title="Flare gun">flare gun</a> into the ceiling, causing a fire that destroys the venue.