While I'm sort of a Guinness drinker, it's too filling for me to even contemplate getting drunk off of it.
One or two is my limit for that beer.
marq: That's not quite true, since:
a) hard liquor allows for quicker delivery (and therefore harder-hitting drunkeness)
b) different types of liquor have other alcohols aside from ethanol in them (such as methanol and propanol), due to lack of distillation and so forth