kevin. i'm don lemon at the cnn headquarters in atlanta. i'm off sunday, and hala gorani is in for me, and i will be guest hosting for joy behar all next week on hln. can you believe it? make sure you tune in. >>> if you only know jimmy fallon from his tv show, you don't know the real jimmy fallon. yes, he may well be the funniest guy in late night tv. he's a veteran of "saturday night live" and an author. he's even got his own ice cream flavor. behind all the laughter is another jimmy fallon. >> piers, you're not going to make me cry, buddy. i saw what you did with oprah. >> the real jimmy fallon. >> properly in love? properly in love, what are you saying? what are you -- >> jimmy fallon, the prime-time cable exclusive, this is "piers morgan tonight." jimmy fallon, your new book is called "thank you notes." we all know them from your show. brilliant, simple idea. >> very quick. you know, when you start a talk show, a late night talk show, you always hope for like the top ten list or the headlines like leno has or whatever like that. we try different things every week. th