"Huh? No! No, there's nothing wrong with your face." Which was truer than was hopefully obvious.

Sayaka found herself shuffling a foot with a gesture as nervous as her short laugh. "Sorry, I thought you were someone else. See, my friend was just here and now she's gone! This always happens..."

Except no one has been near Sayaka's area for a few minutes, obvious to anyone who had been watching her for more than a short while ago.