Recently, while trying out the facetime option with our iPhone 4's, my friend Laura and I were confused by the fact that our screens showed ourselves, rather than each other. In other words, I should have seen her on my screen and she should have seen me. Instead, I saw myself and she saw herself. Our friend Evan witnessed this event and had the following to offer:
Evan: "Maybe it knows you're in the same room. iPhones are that smart!"
(we still haven't figured it out)