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10 EXAMPLES OF HAPPY DAYS AND WHAT'S HAPPENING!! BEING DISTINCTLY SIMILAR IN VERY FUNDAMENTAL WAYS:

Main character is a goody-goody who’s a good student (Richie, Roger)
Who goes to Jefferson High
And wants to be a journalist
Has one friend who’s a 'fraidy cat (Ralph Malph, Dwayne)
Another friend who’s talented but an idiot (Potsie could sing, Rerun could dance)
Restaurant hangout (Arnolds, Rob’s Place)
Sassy little sister (Joanie, Dee (tho to be fair Joanie wasn’t a millionth as sassy as Dee)
Much cooler but curiously older friend (Fonzie, Shirley)
Too many episode plots (roommates can’t get along/babysitting little sister who disappears/neck collar in the courtroom/someone joins a cult etc etc etc)
They only ever go to one of the friends’ house (Richie, Roger)