Quite by accident, I came across a page of beer cocktail recipes, including the amazing colonial American drink flip, made with beer, gin, rum, and heated with a red-hot poker:

A single serving began with two quarts of beer and a half-pint of gin, to which were added four beaten eggs and four ounces of sugar. The mixture was poured back and forth from one pitcher to another to make it foam, then served in a large (!) glass and topped with nutmeg. Flip could also be mulled with a red-hot iron poker (a loggerhead) from the fireplace, creating an agreeably burnt flavor, and then topped with rum.

No one’s going to look askance at you if you order that in a pub! Nonetheless, I find it dubious that half a gallon of beer and half a pint of gin is really a single serving.