Thanks to Carol for pointing out this amazing new feature appearing on Gmail.
I guess everyone’s had their share of drunken emails in the past (especially if you were in college at the time!) so Gmail has implemented a feature that asks you mathematical questions in order to send off an email. If you fail to get them right, no email sent! This feature sounds like an April Fool’s joke to me!
http://gmailblog.blogspot.com/2008/10/new-in-labs-stop-sending-mail-you-later.html