What usually tips you off that your husband/wife, BF/GF, etc., has had that proverbial "one too many" (hopefully a not-too-frequent occurrence :s)?
I'm referring to something that takes place BEFORE they get to the point where are passed out on the floor, or doing the old Technicolor Yawn in the bathroom.
In our pre-parenting days, I always knew that Lady D'Friskies had had just a little too much when she wanted to go get breakfast at a 24-hour diner after we left the party or bar. It usually didn't end well.