Not counting Jon's obvious dozens of vocal screw-ups from recent years, what is the worst mishap you've seen from the band during a live show?

I'll start with a legendary one.

https://youtu.be/-BN9E_7-mhw?t=202

It actually seems like Richie honestly forgets how to play the bridge riff and the sudden key change throws him completely off the map. Jon looks extremely pissed off at him.