Funny, admittedly, but this is not reddit.
I think it's good to keep the quick fun under control.
That said, I think there is a happy medium which isn't entirely po-faced.
Most of the time, if I try to crack a joke, it gets downvoted because it's insubstantive and not all that funny. Once in a while, I've gotten a fair number of upvotes for a humorous remark, such as this one under my old handle:
https://news.ycombinator.com/item?id=14995810#14996229
IIRC, it hit high 50s for total points.