What's Shaking?

Michael J. Fox came up to me the other day and introduced himself to me. He said, "Hey, what’s shaking?"

I said, "You."

Introduction
Day
Celebrity
Parkinson's Disease
Short jokes

Explanation

Explain Bear

Listen up, small-brain. Michael J. Fox has Parkinson's disease, which makes him shake. He used the common greeting 'what's shaking?', and the guy took it literally. It's a brutal joke, just like your ability to process basic humor.