The camera is a Canon Rebel XT (350d) with a 28-135mm lens. As for actually getting the shot, my brother and I timed our shots together, his with the pellet gun, mine with the camera. Counted down 3-2-1, then fire, with my finger pressing the shutter (manually focused to cut the delay) as the can was already exploding. This method worked better than about 60% of the time, as long as my brother managed to hit the can. I have a lot of pictures of the cans just sitting there.
Yeah, I like the spray pattern too, which is why I couldn't bring myself to crop much more than I did. But I still agree with kiwiluke; the background is really distracting. How to solve? Well, I
do have a prime 50mm lens with an f/1.8 that can really blur the background, but to get the framing right I would have to move a lot closer to the target.
Hmmm . . . moving closer to a target getting shot with a pellet gun? I'm sorry, in the interest of safety, I'm afraid I refuse.

Besides, who wants to risk Mt. Dew getting on a camera?
*edit* re-frame the shot to not include a distracting background? Oh. But that would be the easy way!