Oh God, I forgot to mention the other worst beers I've ever had. They're of the snobby, micro-brew, let's try anything variety though, instead of the just plain general incompetence of Dakota Light:
I forget the brewery, but it's the Japanese one that puts the owls on the label. The white one is milk beer. It tastes like soy milk dumped into a beer. It is literally the only beer in my life I didn't finish.
Any Rauchbier, ever (aka smokebeer). I've had a few German one and one American one (Victory's), and they all overwhelmingly taste like that fake "smoke-flavor" juice you can get for meat. The smell of burnt bacon with the taste of horrible chemicals. I keep trying them in the hopes that one day I'll find the one that's like drinking alcoholic bacon grease.