Zac Efron Twerks in Leather Pants and Gives Ellen DeGeneres a Lap Dance

By Quinn Keaney

When Zac Efron stopped by The Ellen DeGeneres Show on Wednesday to promote his new comedy Dirty Grandpa, things got real weird, real fast. The funny talk-show host got Zac to play a bad-behavior-themed game of Heads Up!, which made the actor do some supremely awkward twerking, give Ellen one hell of a lap dance, and make out with his fist. Watch the video above to see every hilarious moment, and then check out some of Zac's crazy-hot shirtless photos!