Should email systems incorporate a sobreity test?

Google Mail Goggles
“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?”

http://gmailblog.blogspot.com/2008/10/new-in-labs-stop-sending-mail-you-later.html

Order of sobreity tests

1) Airplane
2) Trucks and Cars
3) e – mails
4) blogs and faceboox. (spell check should be turned on first.)