Woks's theory

Drink half the first beer, then pour the first half of the second beer into the half full first beer. Drink the full beer (the combination of the first half beer combined with the first half of the second beer), then when the first glass with the two half beers is half empty, pour the remaining half of the second beer into the half full glass. Drink the remaining beer.
Woks's theory. The glass will always be half full when you are drinking.