What is the surprise in fabulous pony maker?

There isn't a specific "surprise" in the Fabulous Pony Maker game that's universally known. It's likely that you're thinking of a specific feature or element that was surprising or unexpected to you.

To help me understand what you're referring to, could you tell me:

* What kind of surprise are you thinking of? Is it a hidden feature, a special item, a particular outcome of the game, or something else?

* What version of the game are you playing? There are different versions of Fabulous Pony Maker available, and features might vary.

Once I have more context, I can help you identify the surprise you're looking for!