AP reports that Fallon has been practicing for the role for a while:
"I've been doing a monologue in my living room the last three years and it was embarrassing," Fallon joked at a news conference.
Wonderful. I'm so glad the rest of the world will get the opportunity to see how embarrassing Fallon can be. If his "work" on Saturday Night Live is any indication, we can expect lots of flubbed lines, breaking character and Fallon generally acting like a jock in a high school talent show.