I don't have any personal stories, but I went to school
at Arlyn studios in Austin and we were told not to sniff
the seats on the couch. We asked why and were told that
when sublime was recording there, they were severely coked up
and took a shit all over the seats and stuff.
We were also told about dimebag and phil pissing all over copy
machines and stuff.
Whenever I own a studio, there will be ground rules and if you don't
follow them, you'll be kicked out, simple as that, you will also pay
for the time spent and not allowed to record again.
Then again, there's a reason I prefer mixing to tracking.