I remember I was at a dinner one night with a famous person who was a recovering alcoholic. I met him at the dinner, all very nice and the rest of it.
Then the next day I saw him at a game. I took one look at him and said "f**k me mate, you must have had a few last night, you look rough as f**k"
To which he replied "Errrr, I umm, didn't drink, I don't drink".
Whoops. My bad.