That's one sophisticated drunk you turn into.
I usually know when Im not gonna have much memories of the night and when I'm in the "Brain sleeps and the man does his thing" condition 2 ways:
1) if I start drinking spirits at 5 PM and I've finished my bottle before 6:30. Things will go wrong.
2) If I have had 4 drinks while my friends are still finishing their first. That doesn't predict good things.