VIDEO: Jimmy Fallon Writes Farewell Letter to Jay on TONIGHT SHOW

Before the TONIGHT SHOW torch passes to him, late-night funnyman Fallon visited outgoing host Jay Leno and wrote him a tongue-in-cheek letter on last night's show. Check out the appearance below!

"The Tonight Show with Jay Leno" features a nightly monologue (the longest in late night), news-making guests, and ongoing comedy segments, including "Headlines," "Jaywalking" and "Battle of Jaywalking All-Stars." The result is a unique and humorous look at the daily happenings in the news and in pop culture.

The program is also a proven barometer of political clout. In 2009, the show made history by being the first late-night show to host a sitting president when Jay Leno welcomed President Barack Obama as a guest.

"The Tonight Show with Jay Leno" is from Big Dog Productions in association with Universal Television. Debbie Vickers is the executive producer.