Board Thread:General Discussion/@comment-2175012-20170823181810/@comment-15895329-20170922004728

^Except, some of his lines actually kind of are funny. At least, any remotely well-written version of Joker anyway. Arkhamverse Joker's Game Over taunts for instance are funny, and I'm not the only one who thinks so.

And really, he DOES have a sense of humor, it's just a sadistic and depraved one. It doesn't mean he doesn't have a sense of humor, it's just not one that others find funny in-universe unless they share his sadism.