Gmail engineers call the program “Mail Goggles.” When activated, the app will pop up before you send any message late on a weekend night and force you to complete some basic math problems — you know, to make sure you’re really all there.

Engineer Jon Perlow isn’t shy about his personal motivation for the tool, either. “Sometimes I send messages I shouldn’t send. Like the time I told that girl I had a crush on her over text message. Or the time I sent that late night email to my ex-girlfriend that we should get back together. Gmail can’t always prevent you from sending messages you might later regret, but today we’re launching a new Labs feature I wrote called Mail Goggles which may help,” he says.

The tool lets you customize for your own Goggle-requiring habits, too. You can change the days and times at which it activates, as well as the “difficulty” level.

Now if they’d only come up with a Text Goggles and Mobile Goggles tool, the world would be a far safer place.

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