Mailinator - Any Inbox. Any Time.
Squat Captcha - The worst captcha ever! Forces you to do 10 squats
Guerrilla Mail - Guerrilla Mail is a web-based app that provides a disposable and anonymous email address. Users of the service are not required to set up an account in order to send or receive emails.
Metal Captcha - A captcha form for metal fans
Fake Mail Generator - Fake Mail Generator is the provider of free and temporary email addresses that you can use just like original one.
O RLY Cover Generator - Create parodies of the iconic O'Reilly book covers