Looks like Joaquin Phoenix might cop a pie in the face from a prison guard in the new movie.

It's difficult to see but at about 01:37

https://www.youtube.com/watch?v=FoFTftmqrjw

...I have zero interest in any more superhero spin-offs, but if anyone goes to see it, let me know if it's good!

It's Joker getting hit with something at 1:37. Further in the trailer it looks like a fight in the mess hall with some food being thrown.