Throughout history, flashes of group mania have taken hold of entire societies without warning. From dancing 'til you're dead, to laughing yourself into a stupor for days on end, the people struck down by these so-called plagues certainly weren’t having a good time, despite what might seem like a non-stop party attitude. One thing has perplexed researchers to this day: what is behind this mysterious phenomenon? This Week's Sponsors: Smalls - So head to Smalls.com/STRANGE and use promo code STRANGE at checkout for 50% off your first order PLUS free shipping! Cerebral -  You can get an exclusive 50% off your first month of therapy by going to cerebral.com/strange  IQ Bar- Now get twenty percent off all IQBAR products, plus get FREE shipping. To get your twenty percent off, just text STRANGE to 64000