Three blondes are on a deserted island with only a bridge going back.
They find a magic lamp.
A genie appears and grants them 3 wishes.
The first blond wishes to be 25% smarter.
She turns into a brunette and swims across.
The second blonde wishes to be 50% smarter and turns into a brunette with glasses,
finds some material, builds a raft and rows across.
The third blonde wishes to be 100% smarter.
She turns into a man and crosses the bridge