Celebrity impersonations are undeniably one of the staples of "Saturday Night Live." Week after week for 40 seasons, hosts and cast members alike have been portraying either the buzziest stars of the moment or some random famous person they happen to have a knack for copying. There have been hits and misses, but when the parodies are good, they become some of the most memorable sketches in history. We salute "SNL" for giving us master mimics like Dana Carvey, Jimmy Fallon, and Maya Rudolph and more throughout the years. Here's a look at 25 cast members and their best impressions ever.