Jack Black overcomes a very real sprained ankle to serenade Conan for his final episode

Conan's final episode aired on TBS on Thursday, with host Conan O'Brien finally bidding farewell to his self-titled late night show after a lengthy 11-year run, and to the late-night format itself. O'Brien has been a staple of the after-dark screen since 1993, clocking 16 years as the host of NBC's Late Night, then a brief run on...