Coby Persin and buddy Hi-Rez are veteran pranksters, and have already made a name for themselves with their last collaboration on "How To Order Mcdonald's Like A Boss." The duo is back with a new video that'll surely impress you.

For their recent prank, Hi-Rez, 21, underwent a serious makeover - he transformed into an 80-year-old grandpa. The duo then hit the streets of Harlem looking for unsuspecting bystanders who'd like to hear this old man rap.

Watch the cool video below.