Bob Denver, the actor who played Gilligan on Gilligan’s Island and Maynard G. Krebs on The Many Loves of Dobie Gillis, would have turned 77 today, January 9, 2013.

Watch his upside-down chin sing a surfing song while young people in bathing suits dance around him in this beach party movie. It’s pretty freaky!

Bob Denver sings “Ho Daddy, Surf’s Up” in the 1964 film For Those Who Think Young