I have been an avid fringe goo-er for several years now seeing about 5-10 (or more on a good year) shows every year. I see scratch at least once and usually twice. If you haven't been, you really have to. Every show is different. Every time I get a good chuckle. Sometimes I don't know the references that they used for the skit (they usually ask for a movie suggestion) and I can usually still figure it out. But its better when I do know them.