Moshe was a holocaust survivor who finally died of old age. When he got to heaven he was able to meet God, and the two of them had a nice long conversation.
At one point Moshe said, “Hey, I have a joke about the holocaust,” and then proceeded to tell it to God.
God listened to the joke and remarked, “You know, I don’t find that joke to be very funny.”
Moshe replied, “Well, I guess you had to be there.”