It's hard, right? And it becomes downright impossible when you're seeing it happen for the first time.
That's the lesson little Leon learned in this heartwarming video, as the tiny tot discovered how funny it was to raise his eyebrows in the mirror. Each face he pulls is more hilarious than the last.
Is Leon the next Jim Carrey? His parents certainly seem to think so, and we're not betting against him.
If he's serious about this comedy thing, all Leon needs is a lesson on the quadruple take and he'll be a star.