As you always expected, there really are little training times for parents on how to make those really good parental jokes. Here's a recent example from our family as we are driving in the car:
Z: I want a pinata at my next birthday party. I never get a pinata.
Me: Why do you want a pinata?
Z: Because they are full of toys and candy.
Me: I see. Well, we will get you a pinata next year but it will be full of broccoli. Ha ha ha!
Yup, the traditional "I'm going to give you broccoli instead of candy" joke. It works every time. Try it!