The Old Dark House (1963)
www.youtube.com
Plotline: An American who sells cars in England receives a mysterious invitation from an old, eccentric millionaire to visit his house in which he lives with...

The Old Dark House is a 1963 comedy horror film directed by William Castle. A remake of Universal’s 1932 film of the same name directed by James Whale, the film is based on the 1927 novel by J. B. Priestley originally published under the name Benighted, and the new screenplay was written by Robert Dillon. The opening title art was drawn by legendary macabre cartoonist Charles Addams, whose signature is painted by a hairy hand.

https://en.wikipedia.org/wiki/The_Old_Dark_House_(1963_film)