[BMK]

A Blonde, a Brunette and a Redhead enter a swim competition.

The must swim a Breaststroke time trial for 50 metres to qualify.

The Brunette and the Redhead finishy in record time and leave the pool.

A swim Coach notices the Blonde at the half way mark in trouble and runs down to find her going under for the last time. He pulls her out.

"They cheated she shouts", as she gains her breath.

"They used their arms".