Here's my opinion.

I think that this incident was just by accident, as I have reason to believe that MidNa doesn't exactly know what mosques are and what they do. Also, the punishment should be a verbal as according to the picture, I don't see anything too bad other than him laughing over something he thought was an actual joke.

What I'm really interested in though, is the guy advertising ALLAHU ACKBAR. Someone should really do something about that. Sadly I'm on my phone so I can't do anything