Some of our favorite YouTubers were recently challenged to try laughing without smiling.
And the results will make you laugh AND smile.
"I feel like I'm killing my heart."
"You feel like you're going insane, right?"
And, of course, Markiplier ends up being strangely good at it.
The experiment, of course, is to prove that even if you try to fake laugh, eventually the absurdity of trying to laugh without smiling will make you GENUINELY laugh - and ultimately, feel really, really great!
Do you think YOU could laugh without smiling?
Check out how your favorite YouTube stars fare, and then let me know below!