I always liked this theme. Just sticks in your head (but then most John Williams scores tend to do that
).
And the use of Joan Jett's "Bad Reputation" as the theme for "Freaks and Geeks" really suited the show. Sure it wasn't written for it but the show seemed to be written for it.
And the last is the theme from the Wonder Years. Just a great use of a great Joe Cocker song.
Hats off to the theme from "Cheers" and "Dr Who" of course