On the series finale of The Big Bang Theory you can expect some solid toilet humor. According to Ausiello Files, the nerds will actually be creating a space toilet!
Kaley Cuoco (Penny) told Ausiello, "The [guys] build a toilet and things go horribly wrong. They all find poop hilarious. It's a space toilet, so I don't have to use it or anything. Of course, it's a space toilet on this show!"
When asked if she felt Penny and Sheldon should ever hook up, she responded, "I don't think it makes any sense. Sheldon has no use for women. If it happened, I bet it would be a nightmare sequence. Sheldon is nowhere near boyfriend material and Penny loves him that way."
She continues to defend her position by saying, "[Besides], Sheldon barely lets her into his apartment -- how would he get to the point of hooking up with her?"