Hello, sailor! For Happy Days‘ leather-clad cool guy The Fonz, that playful greeting could really mean “Hi, dad!” After years of claiming he hadn’t seen his papa since he was a kid (more on that in a bit), Arthur “Fonzie” Fonzarelli finally lays eyes on the man who sired him in the Season 6 episode “Christmas Time,” which aired Dec. 9, 1978. Problem is, doesn’t know the guy’s his dad until he’s gone again.

Here’s what went down when Fonzie (Henry Winkler) finally met his real father on Happy Days.