Julia Roberts: Oscar-winning actress, devoted mother, the reigning hilarious dame of this generation
5. Julia proves she is the last great talk show guest.
All of Julia's appearances on "Letterman" are top-notch, but way back in 1989 she proved she was engaging and hilarious even when she wasn't telling jokes. Here, she avoids the advances of an actual dog and then discusses how she intimidated a whole bunch of actresses simply by listening to Jimi Hendrix.