Zac Efron showed off his biceps under a tight white t-shirt on the set of Townies in LA yesterday. He was also sporting a tattoo of Greek letters symbolizing a fraternity, which is fitting since the film follows a frat boy's antics as they affect the family life of a neighbor. Zac got in front of the cameras after undergoing surgery for a recent hand injury that he sustained while filming with his costar Dave Franco. He talked about the operation during his stint in NYC for the Tribeca Film Festival last week. The East Coast trip included the festival premiere of his other project At Any Price, with costars Dennis Quaid and Heather Graham. There were plenty of other A-listers at the event, so be sure to check out all the stars at the Tribeca Film Festival before the fun wraps up on Sunday.