@HubCityQuestion: Eh, I’d say the Joker’s comedy is meant for as broad an audience as possible, and most people just don’t find it funny because he’s a violent serial killer. Batman’s jokes are private and he doesn’t really care if anyone hears or appreciates them, while the Joker would love nothing better than for everyone in the world to be laughing at his jokes.
I’ll definitely go along with himself, Alfred, and Selina, but I don’t think we’re giving Dick enough credit. Even if he doesn’t specifically laugh at Dick’s jokes, almost every continuity portrays Dick’s tenure as Robin as one of the happiest times in Batman’s career. Part of that was the lack of the tragedies that started to kick in after Dick left, but I also think that when Bruce took in Dick was the first time since he was eight that he wasn’t lonely.
Somewhat-related-but-probably-off-topic note that this conversation made me think of: I think a person’s sense of humor says a lot about them, so while I think it’s appropriate that he’s somewhat serious and moody, I actually find it rather boring when Batman is written with NO sense of humor. In the Bronze and early Golden Ages, he had much more of a dry wit. Oddly, one of my favorite portrayals is Justice League International, where he’s all growly and serious, but drops the occasional one-liner that it takes everyone a moment to realize even was a joke. I guess I sort of like the idea that “Batman” is as much a mask as “Bruce Wayne,” and Batman’s more antisocial behaviors are meant to spook criminals. The “real Bruce” is a bit more human, so a bit of his sense of humor pops up unexpectedly through the “Batman” mask just as a bit of his seriousness sometimes unexpectedly shines through the “Bruce Wayne” mask. As I said, that’s less how I think most writers portray him and more my pet interpretation, but I tend to like a somewhat more human Batman who’s nicer than most interpretations but also screws up more often.