Sometimes the jokes just write themselves:

NEW YORK (AP) - One Oklahoma woman might get cold feet if she comes to New York and tries to hail a cab. But Betty Bell will have to do just that if she's going to whistle.

Bell has the unique ability to whistle with her toes in her mouth.

Bell said it all started when she was 14 and trying to learn how to whistle. "And I said I wonder if can whistle with them because I wasn't having any luck with my fingers and so I tried it and it worked!" she said.

Bell, who once won $1,000 in a mall contest, is hoping that she will win a spot on the stupid human tricks segment on David Letterman's "Late Show." She will compete against five people for a chance to appear on the show.