Jimmy Fallon March 22, 2018 9:17 am 'Tonight': Jay Leno Tags In to Tell Some Monologue Jokes Former “Tonight Show” host Jay Leno steps in to help Jimmy Fallon tell a few jokes during the monologue. US & World Videos 5:49 Kelly Clarkson hilariously attempts handmade pasta with chef Evan Funke 1:36 O.J. Simpson's cause of death revealed 2:03 Does Shakira still believe in love following Gerard Piqué split? 2:36 Super dad makes Mario-themed obstacle course for son's birthday 0:59 Paramedic involved in Elijah McClain's death sentenced to 4 years of probation