Now, now. Pogo straightened that one out years ago.
All the characters would go around, month after month, screaming stuff like "Friday the 13th come on a Tuesday this month!!!" -- so when the 13th finally landed on a Friday, you expected nuclear war to break out or something.
But no, they'd all be calm and happy and one of them would say "Whew! Finally, it's where it's SUPPOSED to be!" and everything was just peachy.