If you're a quirky guy with quirky taste then you may just have heard of a little known indie actor named Zac Efron. Wait, you're familiar? Huh. Small world. All kidding aside Zac Efron is one of the defining heartthrobs of his generation, and his defining on screen nude moment came in the comedy Dirty Grandpa. Efron prances around with just a plush hornet hiding his stinger from our eyes. And we get plenty of looks at his rock hard ass as he does the Macarena at a party. This clip? Oh, it's a must-watch...