What’s your favorite story within a story?

So I was queuing up The Monster Club and I realize I mainly watch out for the first story, The Shadmock…. I also love the vampire story, but the rest of the movie, meh…..

I forget the name for these types of movies, Creepshow, Tales From The Crypt (1972), and the like, but what’s your favorite ‘story in a story’?

Mine:
The Shadmock – The Monster Club
Something to Tide You Over – Creepshow
Wish You Were Here – Tales From The Crypt (1972)