Sneakylong Sardines are one of the best things you can eat.
I certainly believe that from a health standpoint. But I tried some (same brand I think) last year for the first time and it was all I could do to choke down the two cans I had. It ranked right down there with cottage cheese and beef liver with me.
All of the tuna mentions have me hungry for that now, but we don't have any around the house at the moment. Otherwise I'd be chopping up onions and dill pickles now to mix the tuna in with some Miracle Whip and black pepper.