This has been out for a little while, but I just ran across it. Its a new Gmail feature that requires you to solve a series of math problems before it allows you to send an email. By default it is active only on weekend nights, but you can change the settings to cover other times as well. I'm hoping someone here will write the corresponding program to cover texting.
Here's the link if your interested:
http://gmailblog.blogspot.com/2008/1...you-later.html