I think if something's funny, and you want to laugh at it, you should -- unless someone will take it really personally. I mean, I probably would have had more self-control than the host, but not by much. Perhaps the host thought it was intentional at first, so that he thought he was laughing with him.
But I mean, in private, it's okay to laugh at something that's really funny to you. I mean, suppressing laughter on a full-time basis kind of makes life pointless.
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Christianity is different than Judaism only in people's minds -- not in the Bible.