I never get tired of the Bad Lip Reading videos. This one, made for the first Republican Debate, might be the best one I've seen.
Night Flight enjoys Bad Lip Reading videos, too, and posted the "the granddad of these mock-dubbing videos: it appeared on the "Night Flight" TV show back in the day and starred Nancy and Ronald Reagan talking about Nancy's rampant drug use." I remember seeing it on Night Flight in the 1980s and thinking it was terrific. And it still is!