High School Musical trilogy star Zac Efron learned the right way to tip on the DL while at the airport on Thursday. While Efron was all set to slip a twenty into the pocket of his sky cap (a trick he learned from watching Hollywood A-Listers like Ben Affleck and Liv Tyler), an older gentleman who happened to be nearby instead instructed the Hairspray star about the proper way to tip. The gentleman shook Efron's hand and when Efron pulled it back, he discovered a twenty in his hand. Efron was baffled and amazed by the bill and asked the man where he learned it. The gentleman explained that he caught an episode of Friends in college and the rest has been history.
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