If I was actually the kind of person that thought that Missed Connections actually worked, I'd post something like this:
Me: Adorable blonde munchkin, hair in bun, weathered black leather jacket and Frye boots, jamming out to Stoned Roses and eye fucking you like my life depended on it.
You: Tall, lean brunette with lumberjack facial hair, looking dorkalicious in your dijon mustard colored cords and LL Bean jacket. You stood in the doorway after getting on around Wall Street, with your bedhead hair and lopsided smile, and I noticed.
You got off at Union Square, but not before giving me a meaningful stare, which I took to mean "Yea, I see you, and I note that you want to strip me of my mustard cords, down to my lean, sinewy body in my Calvin boxer briefs, and climb me like a tree"
So yea. If I was the type of person to post such things, I'd totally post that.