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That is, until Efron spotted him at a party in West Hollywood, cornered him, and showered him with praise in what can best be described as a blindsiding, WTF moment for Rogen.
But it's better to hear Efron tell the story himself.
During our sit-down with the "That Awkward Moment" star, he told the story about the first run-in he had with his future "Neighbors" costar:
And here we are, years later, on the verge of the release of the fruits of their non-mutual (at the time) admiration for each other.
Yeah, so, years ago, when I had just done "High School Musical," I had always looked up to Seth and gotten his sense of humor. And I was at Sunset Tower -- there was some party that I had been invited to -- and he walked by and I just stopped him and shook his hand and said, "Hey, I just have to meet you, man. My name's Zac. I'm an actor." He said, "Yeah, I know who you are." So I said, "I would forever regret this moment if I didn't tell you what a huge fan I was and I love and respect your work." And he goes, "Really?" And I said, "Yeah." And he goes, "I kind of hate everything about you. I wasn't really expecting you to be cool." I said, "No, I mean it, from the bottom of my heart." He said, "I'm confused. Thank you. Thanks a lot." I said, "I'd love to work with you." And he goes, "Yeah... uh, me too... sure, why not?"
"Neighbors" hits theaters May 9. You can catch Efron in "That Awkward Moment" this Friday.