So very easy to see why Justin Timberlake is a member of "SNL's" five-timer club - yes, there is such a club, and Bill Murray is a member too (and too bad he wasn't there last night) - and why he'll spend all of next week on "Late Night with Jimmy Fallon:" He is probably, pound for pound, inch for inch, one of the best if not the best guests on late-night TV. He gives so much, and so much that he gives is rewarding, that you almost forget he is promoting a new album. He just feels like he belongs in this medium, like a happy fish in very comfortable pond. Last night didn't just merely yield a memorable duo with Jay Z - :"Suit & Tie" - but a classic cold open, and two other opening sketches that were very good. A three-fer to start "SNL?" That just doesn't happen as a matter of course. Obviously "SNL" writers and producers didn't skimp for Justin and never do - lots of star supporting power, a reunion with Andy Samberg, and on and on for what was probably the "SNL" standout episode of the entire season. Let's check out a couple of greatest hits from last night and feel free to disagree (if you haven't seen already) but I don't think you will...Alec Baldwin has hosted 16 times, the record. Timberlake should get close to that record at this rate. On to "Fallon!:"