has ever had to stop a show was ... PROVO.
"I only had to stop a show once in my entire life. I said, ‘Stop, stop, or I’ll stop the show.' And it was in Provo. Only in Provo"
It's when he performed in 2015 on Center Street.
https://youtu.be/ksrHrYspV3I?feature=shared&t=871 at 14:31