What the other kind commenters said. I just found it worked. I like the analogy of the funnel, pointing it 90 degrees from where it usually is. OH&S wasn't such

What the other kind commenters said. I just found it worked. I like the analogy of the funnel, pointing it 90 degrees from where it usually is. OH&S wasn't such a thing back in my day (and I'm not even that old), smoking inside was still a thing (banned in that Australian state I was in a long time ago now). I'd use the air conditioners as a break to get some fresh air. But anyway, a big bin full of glass being emptied was damn loud, but all the concerts I went to wouldn't have helped.