My body is weird with alcohol;
Besides cocktails, just about everything makes me sick very very quickly. Spirits, liqueurs, beer/cider, after maybe half a respective standard drink of each tends to make me ill (beer/cider seems to do it the fastest though). I have no idea why. The strangest part is I don't even get drunk.
Most I've ever had to drink was maybe 8 or so shots of vodka, after which I was definitely tipsy but not drunk. Possibly the only time drinking hasn't really made me sick, but that was a couple of years ago and my tolerance has just been getting worse over the years, to the point where I've given up on alcohol entirely.