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Neighbors, Seth Rogen, Zac Efron, Penis Gallery

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Forget about a bake sale!

When the Zac Efron-lead fraternity in Neighbors (in theaters on Friday) needs to raise some funds, the frat decides to sell rubber adult sex toys made from molds of their own junk.

The ridiculously hilarious molding scene even includes Dave Franco completing the job with a 3D printer.

In honor of this manhood mayhem, we thought we'd take a look back at some of funniest penis scenes in movies.

Take a peek…