Considering the brand of beer they're using, I can think of no better use than to fire the cans out of a canon to smash into various objects. Beer, canons, things to smash, high-speed film. It just don't get no better than that.
Uhmm, do you have something against cameras?
Canon = camera
Cannon = really big gun with which you blow shit up.
Alternatively, "canon" could be The Official Storyline As Judged By Fanboys, which may well store enough hot air to launch beer cans at walls.
Of course, knowing this didn't stop me from spelling it "cannon" in my last post. Oh well.