Then get a Mossberg 590, perfect for crowd-control situation. 12 gauge, 9 round under-barrel tubular magazine, and of course the natural advantages of any spreadgun against multiple targets at short or medium ranges.
...or maybe you were looking for a less-violent solution.
Ah, I was thinking more along the lines of an USAS-12. It looks more like an assault rife than a shotgun, but hey. 10 shells a clip, (20 if you use the drum, which I would.) and, of course, full auto setting. That thing'll take down ten people per burst! (PPB)
Wait, were we talking about guns that are legal? Oops. Oh well, I guess its just me and my USAS, then.
(Mossberg sucks. Franchi is way cooler.)
On topic, I've been to a couple dances/lessons. Hated 'em. I think most guys were just not made to dance. I am probably one of those guys.
If ya love me . . .And ya know me . . . And ya've seen me . . .
I'm Old Gregggggggg!