Few men would be upset to find out that footage of them getting hit with a dildo isn't going to be in a movie, but Zac Efron isn't like most guys. When he agrees to a dildo fight with Seth Rogen, he goes the extra mile.

If you're confused what I'm talking about, you haven't seen "Neighbors," the hilarious comedy that opens in theaters this weekend. Basically, after a frat moves next door to a couple of young parents, the conflict escalates until Mac (Rogen) and Teddy (Efron) are sword fighting with silicon penises.

Efron went above and beyond improvising the fight, going so far as to tell Rogen to hit him in the face. "I was just like 'Hit me with it.' And he slapped me with it, and I just didn't move," Efron said. "And it hurt. It really hurt. It hit me in the chin, I think, and I was just like 'Grrr.' "

It's that kind of enthusiasm that made Rogen nervous about his opponent. "I'm used to fighting James Franco or Danny McBride, guys in their mid- to late-30s who are just trying to get home without getting hurt," Rogen said. "With Zac, I was honestly a little worried. He brings a youthful exuberance to this that I'm not used to dealing with."

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