Gmail has introduced a new feature called 'Mail Goggles' which will activate at a certain time at night (assuming a late Friday or Saturday night) when you might have had a drink or two. Mail Goggles will ask you some simple maths questions before you send an email, which might give you enough time to think about the email you're about to send.
This feature will be annoying and I hope there will be an option to deactivate it, one day it might save you from sending an email to an ex-girlfriend, or your boss that you might regret the next morning.
Will 5 simple maths questions really make you think twice before the email is sent?
If I ever receive a nasty email, and I'll be honest and say I have received a couple in the past, I normally walk away and don't respond immediately. In general, don't write emails or chat messages when you're not in such a good mood and you won't get into trouble.