A few notes from "the good, the bad, the ugly" as they realize there's only one can left, cut the bits where they dive for the can in the bowl of ice and replace with close up establishing shots of the protagonists faces glaring at each other: "There's only one way to settle this" then cut to the outside bit.
Outside, after the second arrow shot, add "I'll get it this time" from bow and arrow man who pulls out a high powered fire arm (.357, double barrel shotgun, something big and beefy) and lets loose on victim.
cut the end scene of victim with arrows in him, just use product logo and voice over. Voice over needs to be meaner and beefy, more Dirty Harry-ish.
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The concept as is is funny as all get go. Tightening it up and taking it up another level (fire arms) would increase this style of humor a bit...
However, I doubt this could be made commercially viable, Way to violent for msm.