Speaking from experience, once you get people (especially a group, and especially if they are eating or have just eaten) laughing, it's easy to keep them laughing, to the point where they are nearly rolling on the floor. And with me, it's because I tend to view the world from a different perspective than others in some ways, I think. All I have to do is start talking about things that have happened to me. I guess I'm referring to being selfish, talking about myself like that, but it often works. ...and we feed off each other's laughter or something... an interesting phenomenon. Never crude or lewd.