So many to choose from. I'll start with what comes to mind first:
Pixies - Surfer Rosa
Absolutely one of the worst albums I've ever heard in my life. Pure and utter trash. If you like it, good for you. Why you like it? Well, that's an answer that is beyond me, I couldn't even attempt to speculate. If this album was in front of me and on fire, I wouldn't piss on it to put it out. I'd rather listen to cats howl at each other. I'd rather listen to goats bleat. I'd rather listen to the sounds of Lady Gaga and Justin Bieber played on an infinite loop, backwards, at the wrong speed than listen to this album. The smell of fresh pig shit isn't as unpleasant as the sounds found on this turd.