I've definitely been called on inappropriately laughing at something. I think I was telling my therapist about a series of bad events and he asked me why I was laughing. I think I said "because it's just such a mess that it's funny." And he was like no it isn't.... I felt really strange about that.
We do sometimes use regular humor. One or the other of us will make a joke. Sometimes he'll make a joke when I'm being all anxious and it's helpful.
Sidony