Probability Comparison: Rarest Mental Disorders

From sleep paralysis, to believing you only have a few days to live, we shall compare the rarest brain conditions humanity's ever known. What is the probability of believing everyone is the same person with different masks? How many people don't believe they exist? Watch this video to find out.

DISCLAIMER:
This probability comparison / comparison video is made based on community discussions and relevant sources, numbers and facts listed might not be up to date, valid or in any specific order. Any relevant source material is linked below.

Sources:
ttps://www.ncbi.nlm.nih.gov/pubmed/16097848
https://curiosity.com/topics/people-with-fregoli-delusion-think-everyone-they-meet-is-the-same-person-in-disguise-curiosity/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4909520/
https://my.clevelandclinic.org/health/articles/11874-stress
https://www.nhs.uk/conditions/7

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