Rebekah's "Experience"

While in the car with Carrell, Rebekah announces that she caught a piece of poop with toilet paper in her hand. My head was spinning as I tried to imagine why. I asked, "why and did you put it into the toilet?" "No, I put it into the cabinet." I'm wondering why I didn't smell this yucky thing in their bathroom. "Is it still there?" "No, a couple days later, I looked at it and poked at it and it was hard and crusty. I put it in the toilet and flushed it. It was an experience." "Do you mean experiment?" "Yes - experiment."