What's your favorite commercial, and why?

I mentioned the Farmers insurance commercials in a thread recently. It brought to mind a few amusing commercials.

Once upon a time commercials ruled. Remember crying everytime a Hallmark commercial came on? If you are younger than forty the answer is no.
Time was, everyone took turns saying, “Where’s the beef?”
Mikey likes it, and nobody doesn’t like Sara Lee.

What sticks in your mind as all time greats?

Is there anything as good lately?