The Munsters: John Doe Munster (1965) (TV)

Synopsis [spoilers]: Once more I will transcribe the Internet Movie Database synopsis: "Herman develops amnesia after a three hundred pound safe falls on his head (and bounces off). The police take him into protective custody and rename him 'John Doe'. The only way for Lily to bring her husband home is to legally adopt him. When 'John' still doesn't show any sign of recognition after ten days, Lily and Grandpa comes up with a plan to shock John back into Herman by having Grandpa disguise himself as Rock Hudson and pretend to woo Lily. He ends up looking more like Rudolph Valentino instead." -- and I will add that that plan was infrutiferous; only when Eddie is in danger after going on the roof to fly his kite is that Herman recovers his memory, triggered by his paternal instincts.