(the video isn't always showing for me in Safari, but it did in Chrome, so if you don't see video, use the link)

Go right to the source and ask the horse
He'll give you the answer that you'll endorse.
He's always on a steady course.
   Talk to Mr. Ed.

People yakkity yak a streak and waste your time of day
But Mister Ed will never speak unless he has something to say.

A horse is a horse, of course, of course,
And this one'll talk 'til his voice is hoarse.
You never heard of a talking horse?
   Well listen to this:

I am Mister Ed.