TIL that on April 20th, one study found a 12% increase in the risk of fatal motor vehicle crash between 4:20 p.m. and midnight on April 20th compared to identical time intervals on control days. Drivers less than 21 years of age, risks were 38% higher on April 20th than on control days. User noneo, in the Today I Learned (TIL) subreddit, 04 Apr 2018