Is pet food safe for humans?

You know, it really makes me wonder if the guy actually did mistake the can of cat food for human food, or if that's just what he said to his friends when they saw the cat food being prepared for them. He may have been too embarrassed to admit the truth. Maybe he just couldn't afford human food, like I mentioned before. Either that or he really LIKES cat food! LOL
I suppose if you've been eating it for years, you've acquired a taste for it and don't think anything strange anymore about eating animal food! Egads!