have you read about this? i think its hilarious. its called "mail goggles" and according to gmail it "will check that you're really sure you want to send that late night Friday email. And what better way to check than by making you solve a few simple math problems after you click send to verify you're in the right state of mind?"
they said its defaulted to weekend nights but you can set it for any time for those daytime and midweek drinkers. via