A couple weeks ago, a friend of mine embarked on a quest to find some new jeans. She walked into the department store dressing room with an armful of items and proceeded to the first available empty stall. Once inside, she went to lock the door behind her, not realizing that there was a full-length mirror attached to the back. As she turned, she mistook herself for another person, thinking that she'd mistakenly entered a dressing room that was already occupied and ... this is the best part ... apologized to her own reflection.
Let me just say that again, in case you missed it. This friend glanced at herself in a mirror, didn't recognize her reflection, frightened herself, and said to her image, "Oh! I'm sorry!"
It should come as no surprise that the person staring back at her simply stood there bewildered for a moment before bursting into embarrassed laughter.