Are you sure you want to send that mail?

I can't tell if this is a joke, but it will not amuse those who are already annoyed by double prompts (e.g. "are you sure that you want to permanently delete this item?") Gmail's "Goggles" goes further, and not only asks you to confirm your intentions, but to perform some simple arithmetic to prove that the message you're about to send issues from a sound mind. So much for spontaneity...