Because just one more and it would be two-farty
Two Thirty.
Because the pee is silent.
How do you get a baby in a bowl? With a mixer. How do you get it out? "With nachos.
Because if there were one more, it'd be two forty. (Too farty) This works much better when spoken out loud. The joke how Irish people pronounce "forty."
Because if you added one more it'd be two farty.
Because one more would be too farty
Because if there be one moar, it'd be too farty!