Aside from Pepto and alka seltzer there is one drink I couldn't get past my nose.
We were in Trader Joe's and needing a bottle of scotch. They had one that was described as being from a northernmost place in Scotland high on a craggy cliff overlooking the crashing surf which "imparted and unique flavor with a taste of the sea. Now doesn't that just sound wonderful. Yup, a bottle of iodine woulda been a lot cheaper! Blech isn't even close. It was so bad that a friend who brags that he's never met a scotch he didn't like couldn't get past the smell!
Next worst - Southern comfort & Dr. Pepper. Ooooh that was bad, I think that was the worst I've ever felt!