Canned vegetables of any kind but specifically green beans and corn. Absolutely disgusting!
I'm also in the fish camp and extend it to ALL seafood. The only kind of fish I will stomach is "fish n' chips" fish...skinless, flavourless, boneless, fried and smothered in tartar sauce until it doesn't resemble fish. I have tried countless times to like it (bites here and there from people's plates) and I inevitably spit it out.
I had some truly terrible beef liver so I won't go near that again!
Oddly I got deathly ill with typhoid fever while living in Mexico. The last thing I had before I started heaving was coffee. I will still drink coffee now though. It's THAT good.