1. In Batman v Superman: The Dawn of Justice (2016) there may be two jokes. One, when Batman rescues "Martha", Superman's mom, he says "I'm a friend of your son". She says: "I could tell by the cape.". Not too bad. Better still is when Batman, Superman and Wonder Woman are preparing to take on the horrible monster at the end, there is some references to this critter being from another world. Wonder Woman says, "I have killed creatures from other worlds". Batman looks at Superman and says, "Is she with you?" Superman says, "I thought she was with you." I may have this backwards, I am doing this from memory. These are both pretty reasonable moments of humor but that is it, that is all there is. Its not enough, IMHO, to alleviate the endless grimness. Yes, comic book superhero movies are important, God knows, but important does not have to mean unrelieved grimness. We are not talking about genocide here, you know.
Oh wait, in the first movie, Man of Steel (2013), we are talking about genocide. Ok, maybe they should be grim.