Google introduced a new Labs feature named Mail Goggles. If you turn it on, on late night weekends, the feature will ask you to perform some math problems before you can send an email. We’re not sure how widespread a problem drunk emailing is, but maybe the delay will allow you to sober up and realize when you’re about to CC your entire company on a rant about your boss, or your adventures with the cute guy or girl in the office. It’s enabled for late nights on the weekends, but once you’ve turned it on, you can adjust the time in the General settings.