April Fools!

On April Fool's Day, Youtube rickrolls you: http://www.youtube.com
Which one does not belong?: http://www.thinkgeek.com
Our big brother gets bigger every day: http://www.google.com.au/intl/en/gday/index.html
Never having to admit that you forgot: http://mail.google.com/mail/help/customtime/index.html
I thought my cache was really, really messed up: http://questionablecontent.net, http://qwantz.com, and http://xkcd.com