First of all, Uncle Jesse (actor John Stamos, a.k.a. Rebecca Romijn’s ex-bitch) was actually a real musician. He knew how to play multiple instruments, sung live on Broadway, and performed multiple times with the Beach Boys. With all that being said, Uncle Jesse’s musical talents didn’t extend to hip-hop. He was a pretty shitty rapper even by shitty rapper standards. His performance in this scene was so terrible that the Beach Boys put sand in his thong and have him a wedgie. At least that's what we like to think resulted from this hilarious mess.