Dave Chappelle Let Me Teach You About MLK Jr. Day

1/18/2016 9:20 AM PST BY TMZ STAFF
EXCLUSIVE

Here's a cool, and educational, run-in with Dave Chappelle outside the Laugh Factory.

In honor of Dr. Martin Luther King, Jr. -- Dave broke down what our photog (who is black) not-so-elegantly described as the "black version of Happy Birthday."

The more you know ...