some people just do seem to miss the Humour Gene ... or maybe have a dry sense of humour that noone else gets ... and they've connected with someone else with that same characteristic ...
I have inlaws who I have never heard tell a joke ... my family is the opposite ... we try to outdo one another with the funny/inane birthday cards etc etc ... my husband tried to give his Dad a funny card and it went down like a lead balloon ...
apples, oranges ... can sit in the same bowl but still very different