Jimmy Fallon and Justin Timberlake were at it again for the third time last night when Justin Timberlake appeared on The Jimmy Fallon Show to promote his new movie, In Time. Once again the duo brought back their crash course of the history of rap by rapping different songs throughout the years. I love when they do these! Part of their history of rap includes LL Cool J, DeLa Soul, Coolio, Snoop, Jay-Z, Nicki Minaj and more. Watch the video after the jump! @Julie1205