Maybe someone went into the head and stood up on the toilet seat as if it was a squat toilet - then it led to a comedy of shit related errors, causing a panic... which led to mayhem and the pilots losing control of the situation.
I could totally see something like that.
I'm not sure but I'm speculating here.....
They may have cut a hole through the airplane from the toilet so that everything just falls out of the bottom of the airplane. And then when they took off they realized that they cut through some of the flight controls.