Hmm, I watch alot. Just on the top of my head.

extra's - Probably one of the funniest tv shows ever, from the guy from the office (uk version) Every episode has a different celeb starring, so far they already had sam l jackson, ben stiller, kate winslet and patrick steward + some more english ones I cant remember atm. It's about this guy who wants to be an actor but never gets anything, so he keeps starring as an extra in the hope of breaking through. The celebs always play themselfes. Ben stiller was a movie director and was hard core pretending to shoot a kid to get the desired scared effect he wanted in the scene. lmao, good stuff.

and these are all pretty known so no need to explain:
Sopranos
24 - Jack Bauer > chuck Norris
prison break
lost
smallville
family guy