Jay Leno plans "something really unusual and different" when he hands over "The Tonight Show" to Conan O’Brien on May 29, 17 years after Johnny Carson left the hosting duties to him. But don’t expect an emotional final show, since Leno and most of his staff are just moving across the NBC lot to produce a nightly prime time show debuting in September. The traditional desk, chair and guest sofa probably won’t follow Leno to his 10 p.m.