I'm at McDonald's with two of my friends and while going sit down I make eye contact with this girl sitting by herself near our table. She doesn't look away for about 2 seconds and I do the same with both of us exchanging a blank face. Couple minutes later I stretch and look over at her and we make eye contact again but this time she gives me a strange look. She was frowning but not in a sad or pissed off way. Like it could've been embarrassment or something but I tried to react by doing a light smirk.

Anyways we break contact, and at about that time we had to head out anyways. It wouldn't have hurt to try to say something. I'm willing to admit taking the L on this one. I just couldn't get a confident read on what the frown on her face meant, and I didn't notice other body language