'Happy Days' Star Donny Most Turns 72: Here's What He's Doing Now originally appeared on Parade. Entertainer Don Most is known by most of his fans for his time playing Ralph Malph on Happy Days.

Henry Winkler revealed that the thrill-seeking stunts his Happy Days character performed on the show were not his thing. In a new interview, the actor, who played Arthur “Fonzie” Fonzarelli on the ...