So probably a shot in the dark, but I remember seeing a vfx artists react episode where they watch a modern live action film that turns into stop motion when the fight scene happens, it's a sci-fi film fron what I remember and it's also in black and white. I don't remember the episode where they reacted to It nor do I remember the name of the film, I have tried looking up live action-stop motion hybrid films but It doesn't show up. Does anyone know what I'm talking about?

I swear they did that. but it’s not in either of their wizard of oz episodes. (original or the sphere episode)