I guess this has happened to someone on the Gmail team because Google has launched a preventative measure. The new Labs feature is called Mail Goggles.
According to the folks who came up with this idea at Google, when you enable Mail Goggles, 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?
The Goggles can kick in late at night on weekends. And if you can't multiply two times five, you'll probably thank Google in the morning.
To activate Goggles, Gmail users should click the "Settings" link at the top of a Gmail page, then go to the "Labs" section.
By default, Mail Goggles is only active late night on the weekend as that is the time you're most likely to need it. Once enabled, you can adjust when it's active in the General settings.
Hopefully Mail Goggles will prevent many of you out there from sending messages you wish you hadn't.