'there's got to be a pony'

In a message to my favorite Aussie restauranteur, I used the expression above. It comes from an old joke about two sons, one an optimist, and one a pessimist. I won't go into the jokes' details, but want to ask, worldwide, if that expression is used and understood?

In the U.S., yes. (Where are you?) It was one of President Ronald Reagan's favorite jokes.

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