Joaquin Phoenix's Joker laugh was medically inspired
What Is Pseudobulbar Affect? Symptoms, Causes, Diagnosis, Treatment, and Prevention | Everyday Health
TV show descends into hysterics as people with 'unusual laughs' attend debate - Mirror Online
Conan Institute of English on Twitter: "#Britishenglish Don't be silly: Don't be an idiot بێئەقڵ مەبە I am chuffed: I am very happy. زۆر دڵخۆشم I am knackered: I am very tired.
Female cop sitting inside car laughing hysterically with partner | ClipStock
Laughing in sleep: What does it mean, and is it normal?
Nervous Laughter: Causes, Psychology, Tips, and More
Why do I laugh hysterically when I get very tired? - Quora