If you're rioting/looting/celebrating the victory of your local footy squad, and you see a cop with one of these -- run in the opposite direction. The Crowd Buster is well-named, firing 20 litres of pepper spray up to 45m.
But it's not just pepper spray -- oh no, this isn't something you keep in your purse. The Crowd Buster is so menacing, it requires a crew of two to operate -- one to hold the pack, and one to spray -- I mean, disperse -- the shit out of everyone. Pellet-fire or fine mist modes are both available, should you want to target particular miscreants or just gas a giant crowd. And once they're writhing in pain, they won't be able to slip away anonymously -- the spray contains a dye that sticks for up to three weeks.