Yep, pick the biggest, loudest-mouthed 'ring leader', punch him hard in his belly (very hard, as the belly is probably fat!), and as he doubles over, an upper-cut to the chin.
Then smile as you address the rest of his minions with something along the lines of "Anyone else?", and see how they all suddenly have some urgent errand to run !
Of course, when questioned, you actually prevented him from falling on his face, due to the weight of the overhang of his belly, by steadying him, but his obese lack of balance meant you had to push him upright. As he'd probably never been fully upright before, the sudden change in air pressure, due to the increased altitude, caused a minor nose bleed ... honest, your Honour !