I know nothing!
John Banner (January 28, 1910 - January 28, 1973).
John Banner (born Johann Banner) was an Austrian-born American actor, best known for his role as Sergeant Schultz in the situation comedy Hogan's Heroes (1965–1971). Schultz, constantly encountering evidence that the inmates of his stalag were planning mayhem, frequently feigned ignorance with the catchphrase, "I see nothing! I hear nothing! I know nothing!"
He guest stars on The Donna Reed Show in "Moon Shot" (Season 6, Episode 14).