Unfortunately, I still occasionally overimbibe. I've been working on stamping out the last instances of drank-too-much, partly because of the calories (I _really_ don't need them) and partly because it's just all too reminiscent of that horrifying few days of vertigo I had and never really want to have again. Tonight, I debugged why I keep getting nauseated/more-than-buzzed from what is nominally a single drink made by my lovely husband, who makes super tasty drinks that I really don't want to give up drinking.
(1) A shot is 1 and 1/2 ounces. It is not one ounce. It is not 1 and 1/4 ounces.
Short form of (2): 1 and 1/2 ounces of 80 proof is equivalent to a 5% beer.
I can have a beer. I can order a drink at a restaurant. I don't have problems with the results. But even when I eat something with a single drink made by my husband, I feel like I've had closer to a double than a single. After walking through the mixing process with him, the problem appears to have been largely located in a misunderstanding of (1), resulting in me consuming half of something that had 2 shots (rather than 2 ounces) of tequila and 1 shot of cointreau. Proportions were fine, but the effect was rather than me having a single (1 and 1/2 ounces of 80 proof) I had almost a double (2 1/4 ounces of 80 proof) -- and that's assuming that the alcohol was mixed evenly throughout the whole drink, which is never a sure thing.
The good news is, I believe we have identified why a drink at home != a drink in a bar or restaurant.