If it did the Phish noise when you pulled the tab, i would think it still drinkable. There might be some carmelization of the corn syrup used a the sweetner. The phosphoric acid content should limit any bacteria growth. Like was said in another reply, the zinc might leach from the can metel due to the acidic content, but that would cause the can to leak.
If you do plan to try it, i'd make sure some one else was aware of it. Also, find the number for your local poison control center so it would be handy if something struck you down.
Good luck on your great sceintific adventure.
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When all else fails, QUIT.
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