Weirdly enough, at certain amounts of alcohol, I start to think about memories I haven't had in years. Nothing traumatic nor nostalgic, but just mundane memories from school or childhood. I suppose it's just the mind wandering to thoughts it normally doesn't think about while inebriated, forming unusual connections.
There's even pop culture references for such a phenomenon. As an example, in the movie Beerfest, they get one of the characters drunk so he can recall the way to a secret place that he had only previously experienced drunk before.
I actually once had a situation like this- in the village in NYC there is a secret club/lounge my friend took me to one night. That area is just filled with bars that these days are overrun with tourists and the post-college crowd. I went out to dinner with a friend one night about two years later, we had a few, and were looking for a night cap, and I was like ugh, lets just leave the neighborhood to avoid these loud places you have to fight for space in.
But... then I walked by this almost suspectly non-descript steel door at the bottom of a few stairs, and some part of my brain said "there is a secret club/lounge behind this door." It was kind of surreal. I hesitantly opened it, and what do you know... there we were.