The Goggles can kick in late at night on weekends. The feature requires you to solve a few easy math problems in short order before hitting "send."
If your logical thinking skills are intact, Google is betting you're sober enough to work out the repercussions of sending that screed you just drafted.
And if you can't multiply two times five, you'll probably thank Google in the morning.
There's no shame in admitting that sometimes you need a little extra help. Gmail engineer Jon Perlow designed Goggles with his own weaknesses in mind.
"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 e-mail to my ex-girlfriend that we should get back together," he wrote when announcing Mail Goggles on a company blog.
But sometimes I write my greatest works while drinking. 'Tis the only time I have the (liquid) courage to do so. :)