Here are some randomly selected joke topics beginning with the letter 'D'
Disinformation
Disinformation is not as good as datinformation.
Disagree
Bill: Does this hot weather disagree with your mother?
Fred: It wouldn't dare!
Disco
I met my wife at a disco. It was really embarrassing. I thought she was at home looking after the kids.
Diplomacy
Diplomacy is the art of saying "nice doggy" until you can find a rock.
Disagree
I could not possibly fail to disagree with you less.
Dishwasher
My wife thinks she should have a dishwasher.
You're lucky. Mine thinks she married one.