a deflator
A deflator is like when life kicks you in the nuts and laughs at you. It happens during video games, when your mom yells at you, or when you realize your life is just a bad movie that nobody wants to watch.
I was winning the game, and then I lost. Life is a deflator.
My mom said I was going to be a rock star. Now I’m a janitor. That’s a deflator.
I got a D in math. That’s a deflator.