Cleaned out the camper earlier this summer and found a can of beans that had been in there for 13 years. Needless to say it had been through some extreme temps. Decided to give it a try out of curiousity. It wasn't terribly bad but not your regular flavored can of beans. I was surprised that I didn't have any bad effects that night but I survived.
If the can had bulged or been rusted I wouldn't have tried this but I just had to tempt the canned food gods.