While staying with Grandma Bieber for the holidays, Pop’s Bad-Boy Justin Bieber found a way to spice up his stay. While sleeping in late Thanksgiving, and awakened by the noisy family hustle, Bieber decided he would prank his family by getting naked and playing the guitar, very reminiscent to the scene from Forest Gump. impromptu lyrics … like, “I Loooove you grandmaaaa … how are youuuu … helloooo grandma. soared from JB’s lips, as ‘Put some clothes on” soared from the lips of his unimpressed grandmother. Get into this foolishness below, but its always good to play a nice “prank” on granny every now and then.