Friends don't let friends email when drunk

"... "Mail Goggles" (is)...designed to stop you from sending that 3 a.m. message to your ex begging her to get back together with you. It's similar to a car that requires you to pass a breathalyzer test before you can turn the ignition on.

Once you enable Mail Goggles, it's only active late at night on weekends, the time you're most likely to regret sending a message. Before your message is sent, you will be asked to complete a set of math problems, which Gmail hopes will make sure you are sure you want to send that message. Here's what that will look like..."

hmmm...some of us would have trouble passing that math quiz even when we're sober...