WATCH: 31 strange medical conditions
More from Mental Floss...
33 fascinating stories behind famous songs
The strange origins of 32 superstitions
38 sweet facts about candy
John Oliver makes an impassioned case for vaccinating kids, with only a brief dig at Trump
McConnell allies give him better-than-even odds of getting his GOP health-care bill passed this week
Jared Kushner finalized $285 million 'bad boy' loan with Deutsche Bank a month before Trump's election