Normally doing an impression of the person you're talking to would be kind of rude, but Jimmy Fallon's making it a regular habit and totally pulling it off. Last week it was Mick Jagger, and last night it was Jerry Seinfeld. Fallon admitted that not only does he do a Seinfeld impression, but two of his career highlights involve it. Of course, he then broke out the impression. And of course, Seinfeld matched it, doing an exaggerated version of his trademark delivery. With the first season of "The Marriage Ref" coming to a close, let's hope Seinfeld finds other things to promote - it's been a treat watching him make the rounds.