Well i surely did … unfortunatelly, this little plugin for Gmail was not there when I needed it the most …
Just enable Mail Goggles in the Labs page of your Gmail options, and you’ll find youself infront of a math problem whenever you want to send an email. We all know how difficult math is after a night out :) ) You can even tune the plugin in the General tab of the options panel after you enable it.

Enjoy :)