Swimming Blonde
A blonde, a brunette and a redhead were out on a boat one day when it broke down 20 miles shy of a island.
The three decide on swimming for shore.
The redhead goes first. She swims two miles, gets tired and comes back.
The brunette goes next. She swims seven miles, gets tired and comes back.
The blonde goes last. She swims a miraculous 19 miles, gets tired and swims back.