I tried vegemite once too and could not swallow it, and I can eat almost anything. It was seriously terrible. Most everyone I know who's tried it says the same thing... makes me wonder how the hell Aussies eat it.
Not me, but this story will surely make you gag. My brother was always a jerk growing up and would steal things from me, including pops etc. Well, I was sick one time when we were on vacation, hacked up a bunch of phlegm but was in a building with no bathrooms or fountains in sight, so I spit it into the empty pop bottle I had just finished drinking. I set it down sometime later only to watch my brother snatch it and down the 2oz of spit/mucus blend in the bottom. He thought he was being his usual d!ck self stealing the last bit of my pop, but he knew as soon as he swallowed that it wasn't soda. lol. Serves him right.