Boris Karloff is one of the icons of horror films. Made famous by playing Frankenstein, Karloff went on to play many evil monsters in film. Most kids today would recognize him for his voice in The Grinch, but it's about time they were introduced to Mad Monster Party, I think. By all accounts Karloff was a kind, gentle man. According to a Wikipedia article, every year he dressed up as Santa Claus and visited disabled children at a hospital in Baltimore.
Mad Monster Party? is a campy cult classic and a madcap monster mashup. In fact, the screenplay was written by a Mad Magazine creator and a Mad artist was instrumental in creating some of the characters. I haven't watched it in years, but I intend to rectify that today. The dvd is still available for purchase and you can stream it from various places if you look around.
Here is a preview if you're not familiar-
Make sure you grab a cocktail and put on a feather boa before you hit play.