Stout tends to make me sicker than just lager or ale, and give me a worse headache. Four pints+ on a friday night(directly after a week of work) is a good way to start a bad morning after. O'course, less of that now that I no longer reside in Ireland.
Maybe because stout is easier to drink quickly? (Less bubbles in your throat) Well it is, but that's probably not the cause.
It's been a while since I threw up to the point where the dark vile-tasting stuff surfaced. Not referring to the Guinness 😛 It's funky, 'cause some say it's not dark, but rather sort of whitish yellow. I think I've seen both? But not for some time.