The inmate follows Arthur's murderous footsteps, punctuating his punchline by shanking Arthur. As Arthur bleeds out on the floor, his killer begins laughing uncontrollably. Then, just out of focus in the background, we see him carve a smile into his face, an unmistakable nod to The Dark Knight 's Joker's scars. Oh, brother.

Joker: Folie à Deux is now out in cinemas, with Joaquin Phoenix reprising his Oscar-winning role as Arthur Fleck. If you're planning on watching it this weekend, you might want to know ahead if there are any post-credit scenes to stick around for. Here we tell you how many credit scenes are in Joker 2, without including spoilers about the ending.