Seinfeld has many legacies: It's one of, if not the, best shows of all time. It's probably the most conversationally referenced piece of pop culture of the last 20 years. It gave us phrases like "close-talker," "low-talker," "sideler," "man-hands," "two-face," and, of course, "double-dipper." But perhaps one of it's most intriguing stamp on pop culture surrounds all the celebrities who had guest spots on the show before they were bona fide stars. Click ahead to see the impressive list of talent you could argue Jerry and company discovered.