Back in college after a night out, we went to a local pizza place many of the students stopped at after a night of drinking. Our large mixed gender group crammed into a booth, with me on the outside struggling to keep myself from falling off the edge while sitting next to a cute dark haired girl I was pretty good friends with. Across the aisle and a couple booths away was another group that I noticed when a girl on the bench facing me got up from the booth in a very unladylike fashion, stretching one leg out then the other, which gave me a very good view of her black panties under a denim mini skirt. She walked past our table to the trash can to throw some items away, and while passing our table my dark haired friend said out loud to nobody in particular "Oh, I have that same skirt!" referring to the girl who I just upskirted. I watched as she walked back to her table and got back into the booth in the same unladylike manner and continued to sit with her legs further apart than they should be for the length of skirt she had on.
That's where the truth ends because of the size of the group we were with, but in my head I'd love to think that I pointed out this girl to my dark haired friend with a comment like "Do you sit like that when you wear the skirt too?" In my mind it gets even better when she replies "No, I can't do that because I usually don't wear panties!"