http://youtube.com/watch?v=P-gMH3ugUkU 

In its final season on CBS, someone got the bright idea to freshen up “The Bugs Bunny Road Runner Show” with new opening titles and theme song. I remember this quite well — but what I didn’t pick up on as a child was the faux-Fifties “Happy Days”-esque tone. Why would they try to contemporize an old show with a retro look? Anyway, it lasted a year before CBS’ rights to the cartoons ended and drifted over to ABC.