What are some television shows that occasionally played around with their intros or outros?

For example, Person of Interest alters its intro monologue for a few episodes, the most prominent ones being 2x16 "Relevance" and 2x21 "Zero Day".

Here is the intro to "Zero Day". [SPOILERS, obviously]

An example of an outro being changed is LOST. After every episode of LOST, the show would cut to this. However, after the season 5 finale, the outro was changed to this. This is because the season ended with .

What are some other shows that have done similar things to their intros or outros?