On Monday night, Jimmy Fallon was Jay Leno's guest on The Tonight Show.
Fallon did one of his popular Late Night bits, "Thank you notes."
After delivering a few humorous Thank you notes, Fallon offered a serious note of thanks to Leno.
JIMMY FALLON: Thank you, Jay Leno, for carrying on the proud tradition of The Tonight Show hosts with such humor and class, and for being nothing but gracious and generous to me over the past years. I will do my best to make you proud every single night. Thank you.