He'll TELL you when he's had enough!
This is my phobia: that someone will sip from my beer when I'm not looking.
There is probably a word in German for feeling like you're going to throw up while also feeling compassion, amusement and like maybe it is time to do a "dry month." Look, I hate water bugs (this is the colloquial New York term for a cockroach that size. No one from outside the city ever knows what I mean when I run out of the bathroom screaming, "WATER BUG!!!"), but we're all God's creatures. And all of God's creatures need to get hammered from time to time.
Hammered via pints of light beer or the bottom of a shoe, whatever.