To promote their new animated movie ‘The Lorax,’ which lands in multiplexes next weekend, Taylor Swift and Zac Efron, who are not a couple, embarked on an Ellen DeGeneres-designed ‘dance dare’ at the film’s Hollywood premiere. If you are not familiar with the concept of a dance dare, it’s basically when you dance around people until they notice and/or catch you. Silly? Yes? Super fun? Definitely.