I should say that I am not talking about some strict rule where the post gets deleted, etc. I think a joke here and there which provides some levity is not a big deal. And, I am not going to be the big bad wolf and jump in and warn everyone.
I certainly don't want a user to sit there with a witty remark trembling and wonder if he/she can post it. Just as long as it doesn't take the thread deep into the woods.

PS I would never delete a post. I may lock it for a few hours, but never move or delete a post. On here, that would be an abuse of power.