When sisters Alisha and Acantha attempt to do a sexy scene together, things devolve into fits of laughter causing both girls to pee in their pants.

Alisha tries to get her sister, Acantha, to join her in a sexier scene.  The plan is for them to make out and rub one another.  Acantha, however, finds the whole idea of doing such things with her sister comical, sending her into fits of laughter.  Her laughter is contagious, causing Alisha to also break down laughing.  Eventually, they both end up laughing so hard that they pee their pants.