The Tonight Show got the last laugh on Levi Johnston. The soon-to-be Playgirl model threatened to sue if Conan O’Brien didn’t retract Wednesday’s poetry session, featuring William Shatner dramatically reading Levi’s supposed Tweets. So O'Brien admitted they were actually written by “a clever impostor posing as the witty Levi Johnston”—then brought Shatner back to read some “real, verified quotes.” Highlights: