Though it wasn't the first to play with words, the "Who's on First?" routine by Abbott and Costello is perhaps the most famous of its kind. Started in the early 20th century, the sketch has been a hit ever since. Most folks have at least heard of it, if not heard the actual thing. It's something of a landmark, and budding comedians everywhere tend to give it a go. Jimmy Fallon, with the help of Billy Crystal and Jerry Seinfeld, has produced a sequel to the routine on Late Night With Jimmy Fallon, and let's just say we were pleasantly surprised.