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Because cartoons are the best source of security advice...
Bruce Schneier, on the other hand:
This is why the oft-cited XKCD scheme for generating passwords -- string together individual words like "correcthorsebatterystaple" -- is no longer good advice. The password crackers are on to this trick.
use random unmemorable alphanumeric passwords (with symbols, if the site will allow them), and a password manager like Password Safe to create and store them.
There are three comics that tell you all you need to know:
One) Are all methods computers have to determine randomness correct?
Two) What does random even mean, as a lot algorithms to get random numbers are badly implemented?
Three) What is entropy, or "Why are longer simpler passwords harder to crack than shorter more complex passwords"?