I can’t think of any situation that really calls for jazz hands. Even dancing. On the other hand, there are some situations where jazz hands are much more inappropriate then others. I can at least understand why they could be worked into a dance routine, but if you’re a member of the clergy, there’s no reason for it, aside from performing a musical rendition of the Ten Commandments.
Derek Chatwood uses his artistic vision and his extremely twisted mind to display just a trio of inappropriate moments in jazz hand history. Stephen Hawking on Ice anyone?