Gmail prevents you from sending emails when pissed
This is just plain genius… and something
we all agree would of done with at one stage or another (usually drink
related).
"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.
When you enable Mail Goggles, it will
check that you’re really sure you want to send that late night Friday email.
And what better way to check than by making you solve a few simple math
problems after you click send to verify you’re in the right state of mind?"
More….

