WATCH: Phone goes off before Tiger Woods' swing at PGA, upsets gallery

It's fair to say Tiger Woods drove the ball atrociously during the final round of the US PGA - but it doesn't exactly help when a mobile phone goes off. 

Hit the link below to watch a ringtone sound to the groans of upset Tiger fans just moments before the 14-time major champion pulled the trigger..

“I thought I might see a riot,” wrote the fan, who posted the video to Reddit under the username carpedonnelly...

WATCH HERE