I've had those "looking back I was a total fucking idiot" situations too.
Back when I was a freshman in college, I had a geology lecture during the spring semester. There was this one girl with long blonde hair, a gorgeous face with blue eyes, great body and big tits who started talking to me quite a bit. One day it was quite hot out, so the lecture hall was air conditioned like crazy. We ended up sitting next to each other near the back (I can't remember if I sat down next to her or vice versa), and she began remarking on how cold it was in there. She was wearing either short shorts or a skirt, btw. She then mentions how she has goose bumps all over her thighs, then takes my hand, puts it on her inner thigh and starts rubbing while she says "Lookit all these goose bumps!". I mumbled out just a "hehe...yeah", and it's probably good I didn't say anything more because it probably would have come out as utter gibberish.
She seemed way out of my league to me, and I convinced myself that she was just being friendly with me and on that particular day wanted to share the fact that she was really cold in that room.
Was she flirting with me. I JUST CANT TELL.
WAS SHE?
WAS SHE?
God, what I WOULDN'T GIVE for another opportunity like that.