Marcello Hernández talks about the key to doing his Sebastian Maniscalco impression on SNL, failing a math test after taking someone's ADD medication and walking out to Bad Bunny for his stand-up special American Boy. The Tonight Show Starring Jimmy Fallon. Stream now on Peacock: https://bit.ly/3gZJaNy Subscribe NOW to The Tonight Show Starring Jimmy Fallon: http://bit.ly/1nwT1aN Watch The Tonight Show Starring Jimmy Fallon Weeknights 11:35ET/10:35c Get more The Tonight Show Starring Jimmy