It went down one day last week right in the middle of the show. Of course that was because a 3-4 yr old kept running away from their parents in the front row. We watched it happen a couple of times, parents laughing thinking it cute I suppose. A CM warned them once, but finally the kid crossed the security line and the CM had to hit the emergency switch to shut it down and we all had to leave.
It takes some time to get it back up and running- over 2 hrs in our case. They often have trouble bringing it back up.