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I was at a South Houston range ~25 years ago, and a fellow at the far right hand stall had a MAC.

There was a range officer or instructor with him, telling him over and over again that he would need to control the muzzle because the muzzle was going to rise on him once he started spraying. The fellow with the MAC was impatient and kept saying, "Yeah, right, I got it".

And then impatient guy with the MAC pulled the trigger and stitched a neat row of holes in the gypsum ceiling panels leading back to the panel above his head. As fascinated as I was by a guy with a MAC, I decided to leave.

I'd hate to have something like this happen when I'm bringinig new shooters to the range, and have it scare them away. Either way I'd use it as an example of why gun safety is so important.