I uploaded before the video of Phantom bloopers, and now I give you Les Mis. Just listen Vikidal Gyula as Valjean.
Yep, we all make mistakes...

It's really interesting video of Phantom bloopers. These are a lot of audio recorded from different performance eg Katie Hall or Tabitha Webb etc. As we knows, everyone can make a mistake, whatever whether it's a small mistake in text or tragic sound at higher notes. 

But we knows too, that good actor (or actress) know how to improvise and show people in a theatre that it was intended effect.

2004 movie, bloopers

Hugh Panaro as Raoul

Edit: This isn’t Hugh Panaro, it’s Björn Olsson in Hamburg. They're both very similar.