No idea

I was walking out of an appointment on Tuesday, and passed by a restaurant with big glass windows. I usually go past it, glance in, see if I see anyone I know. Occasionally I'll see an old student and wave hello.

This time, however, was different.

I'm strolling by, headphones in, and this cute girl waves at me. She looks like she could be a student, so I wave back. She suddenly looks awkward, so I ask through the glass, mouthing the words "Do I know you?," and she just keeps giggling.

I'm unsure what's going on, so I double back and head inside. I see her, face to face, and ask "Do I know you?"

She giggles, and mumbles "No" and then runs away.

These things really happen to me.