Because if there be one moar, it'd be too farty!
Just one but he wants to do it thirty-two times and when he's done everyone says that his last light bulb was much better.
One. No, two! No, four! No, eight! No, sixteen! No, thirty-two! ...
Because if you add even one more it gets "2 farty".
Because just one more and it would be two-farty