Before Jay Leno, there was Johnny Carson, and before Johnny Carson, there were Jack Paar and Steve Allen. Conan O’Brien was thrown in there for a couple months when Jay Leno retired the first time, but now we have “The Tonight Show Starring Jimmy Fallon.” Fallon went in with a bang during his first episode as the new host of “The Tonight Show” Monday night. With Fallon’s previous duties hosting “Late Night With Jimmy Fallon” and his time on “Saturday Night Live,” we knew he could only succeed at being the host of “The Tonight Show.” He brought genuine enthusiasm, effortless comedic bits and just a breath of fresh air to the NBC midnight timeslot.