I dare you to do this right now, wherever you are:
Take a deep breath and let out the fakest, most ridiculous "HA HA HA" you can muster.
OUT LOUD. I'm serious!
... and go!
Did you do it? How'd it feel?
Did anyone look at you funny? Did you look back funny?
Did you smile after?
Report back.
This is important scientific research (not really, but kinda, so do it anyway).