While that behavior is nauseating on a sketch comedy show, it's perfectly appropriate during a late-night talk show. Letterman, Conan, Ferguson and Kimmel all do the same thing.
Also, Fallon owns. Haters vacate.
Funny, I was going to post that clip. Though it may be the only time I've laughed at Fallon's show ever. (I thought his Breaking Bad skit was a total waste of time, for example)
Anyway, I'll check out an ep or two when Fallon transitions into the Tonight Show. The sad thing is if Conan had swallowed his pride and done a 12:05 Tonight Show, he'd probably be getting his timeslot back in September.
Though who knows, maybe he'd just get screwed in favor of Fallon.