#1. The TV Series was supposed to be titled "Cool"
#2. "Happy Days" spawned 3-8 spin-off series (depending on your definition of a "spin-off")
#3. Potsie would sometimes provide the singing voice heard in the Jukebox
#4. Fonzie wore a windbreaker when he made his first appearance instead of his famous leather jacket... why?
#5. The Monkees' member, Mickey Dolenz was a front-runner to play the part of Arthur Fonzarelli.
#6. Robin Williams (RIP) didn't even have to audition
#7. Al Molinaro reprised the role of Al Delvecchio in the 1994 music video for "Buddy Holly"
#8. "Happy Days" the Musical was a real thing
#9. A few cast members filed a lawsuit against CBS
#10. Fonzie's motorcycle went for up auction as part of Bonhams' Classic California collection in 2011
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