Vodka, after a very bad night in Bangkok...a sip of booze for about 3 weeks after made me feel ill!!
Also, a incident one night with a bit too much Gin where I was sick all over someone's floor, who I had only known a week (and is now one of my best friends!)....which is known by some of my friends as the Ginsident
And....SaPa Rice Wine (local Vietnamese rice vodka stuff)....not that I'm likely to come across where I go out, but that nearly had brown stuff running down my legs before I made it to a (thankfully) empty toilet!!
Oh...I could probably touch it again if you dared me, but Vietnamese Snake Wine....
It isn't that bad at first, but then the taste of death develops in your mouth....I am annoyed I didn't bring any back, but I wasn't sure what customs would think