This article was written 3 years, 8 months, 4 days ago. I'm pretty sure there's been plenty of time for "this is fun" to propagate through the masses.

Also, as stated in his The Usability of Passwords - FAQ (http://www.baekdal.com/tips/the-usability-of-passwords-faq):

Q: So, are you saying we should use "this is fun" as our password?

A: No, I'm saying that you should use a 3+ word pass phrase as your password. Something that isn't linked directly to you or your immediate interests. So don't choose the names of your three kids.