The absolute worst beer you can get anywhere is...

[Gophernut]

Originally Posted by jitzy

Bud lime it tastes like window cleaner

I agree completely, but my wife happens to love the stuff. Maybe she drinks it because she knows I won't.
The worst beers I ever had were a beer I bought in Grand Rapids, Michigan called BrauMeister. Not MeisterBrau, BrauMeister. This was in the mid '80s and it went for around $6 a case, and I think may have even included the deposit on the cans. Horrible.
I also bought a case of Cold Spring Light when I was in college, and I drank only six of the case. Don't think I ever finished them. Just ghastly. Didn't get a buzz, just went straight to the headache.
The most recent bad beer was a Bud Select.