The Brain That Wouldn't Die was a 1962 Science Fiction/Horror film that was released in the United States.
"Are you feeling any better today, Chuck?"
"No, my deformed friend. Like all quantities, horror has its ultimate. And I'm that."
"Hey, that's from The Brain That Wouldn't Die, right? I love that movie. I never through I'd be able to relate to Jan in the Pan."
The term "Jan in the Pan" was not used in the original movie. It was brought up in an episode of Mystery Science Theater 3000 where the cast heckled The Brain That Wouldn't Die.
The Brain That Wouldn't Die on Wikipedia