I very very rarely ever drink past the point where you can close your eyes and feel the room spin. it's a little limit I've set for myself years and years ago after promising the base of my toilet while holding it tenderly, that I never wanted to see it at that angle again.
:-P
Now after every drink before allowing myself another one, I must be able to close my eyes and not become dizzy. if alls well, order another one. If not, order coffee.