This week, Jimmy Kimmel is taping his show in New York, the concrete jungle where dreams are made of. Jay-Z, the new Sinatra, stopped by Kimmel's Brooklyn set, which is somewhere between his childhood home of Bed-Stuy and his current TriBeCa loft.

Back in 1990, a young, tiny Jay-Z freestyled on BET's Rap City, riffed on his name, and dropped the phrase "Jay Z's embarrassing." The look on Present Jay-Z's face after seeing Young Jay-Z is priceless, as he says that Young Jay-Z was a prophet to say that it's embarrassing. This throwback is perfect for Back to the Future day. 

Sources: Jimmy Kimmel Live