While we're on the topic of scorching walls at venues...
I heard from someone who knew someone or some such thing, a while back...
...There was once a laser show operator that set up something like 2 or more 50+ watt YAGs at an NSync show back in the 90s or, perhaps the early 00s... All was well for the show and it was bright lazors everywhere blah, blah, blah.
The part that seemed notable was the account of the house lights coming up after the show was over, and black marks becoming evident all across the adjacent walls from his laser.
Anybody heard this one? I have no idea who told me this story, nor do I have a clue who the operator was. Funny (and scary) story though.
-Jonathan