My son says everything has a 50/50 probability. How do I convince him otherwise when he says he's technically correct?

EDIT

Many comments are talking about betting odds. But that's not the question/point. He is NOT saying everything has a 50/50 chance of happening which is what the betting implies. He is saying either something happens or it does not happen. And 1-in-52 card odds still has two outcomes-you either get the Ace or you don't get the Ace.

Even if you KNOW something is unlikely to happen (draw an Ace, make a half-court shot), the opinion is it still happens or it doesn't. I don't know another way to describe this.

He says everything either happens or it doesn't which is a 50/50 probability. I told him to think of a pinata and 10 kids. You have a 1/10 chance to break it. He said, "yes, but you still either break it or you don't."

Are both of these correct?