A brunette, redhead, and a blonde woman are stranded on a deserted island. The mainland is 100 miles away. They each decide to try to swim there individually. The brunette goes first; she swims 25 miles, then gets eaten by a shark. The redhead goes second; she swims 40 miles, gets tired, and drowns. Finally it's the blonde's turn. She swims 50 miles, then says: ""Wow this is tiring, I'm not sure if I can continue"" and swims back to the island.