Garfield and Friends just for the Garfield part, Tom and Jerry, Mostly anything Bugs Bunny, and (if allowed) The Simpsons. I have always loved GF and still do since I was 6.
Tough one. I'm gonna go with Excel Saga just because it's style of humor strikes the perfect chord with mine, but ATHF (up until the most recent couple season) has been hysterical, and South Park is pure genius.