Friends husband keeps saying he is going to eat our guinea pigs!

Well, personally, I would just not smile or say anything at all when he says it. In fact, I would change the subject and comment on something else as if you never even heard him....until he gets the idea that it's "old" and boring.

I have a club in a game and now and then a couple comes in and wants to start some racy talk about each other they think is cute in front of the others....we don't comment and just talk about the music like they're not even there. And they shut up.