Another theory is that the fruit on the Tree of Knowledge was actually poisonous.
Adam and Eve ate the fruit and the snake (Satan) was laughing his butt off knowing that it would give them the shits.
Adam and Eve spent the next few days having the squirts all over the Garden and God became angry that they were stinking up the place since they had not yet installed the indoor plumbing in their new house.
They kept plenty of leaves around since they did not know where to buy toilet paper.
Anyway, they were cast out and the rest is history.
Rub a Dub