I notice that the only beers which really give me a bad hangover are the macro lagers. I was over at a friends house yesterday and had about 6 Molson Canadians. Four hours later I felt like shit, and I didn't even get close to drunk. Last night I drank about four 1 pt. 6 fl oz. bottles total of Stone's Arrogant Bastard Ale and Ruination Imperial IPA and barely felt anything when I woke up this morning, aside from the usual post-drunken thirstiness and dry hop mouth. This is some pretty strong beer, alcohol-wise, and I was pretty drunk when I went to bed last night, too. The impurities and adjuncts used in cheaper macro beers are mostly responsible for the hangover one gets from consuming too much. People don't realize this and think it's soley a product of the alcohol. It seems as if alcohol and cheap ingredients mix in a very strange way. The worst hangover effects I usually notice with macro beers are a terrible headache and some nausea to match it. It makes my lower back tend to ache, too. It's just yet another reason why good beer is worth the money.