I think the tittle of the thread should read: How do you deal with Stingy JW's!
Geesh, JW's are by far the stingiest people I've ever known! But if you are constantly getting screwed over by some miser, Just invite him or her to a restaurant one day (try to bring as many friends as possible) and order food and drinks (as expensive as possible)... after eating and ordering coffee and dessert, have your friends one by one start getting up to "go to the bathroom" until one by one you all leave the restaurant, but just before leaving, tell the manager that the guy at the table will be picking up the tab. Then take off. And he's stuck with an 800$ bill.