Three blondes are standing at the edge of a river
They want to get across so the first blonde says "I want to be 10% smarter" And turns in to a brunette and swims across the river
The second blonde says "I want to be 20% smarter" and so she builds a boat and goes across the river
The third blonde says "okay that's it I want to be 100% smarter and turns into a man and walks across the bridge