Free Beer & Hot Wings – Whistling Two Notes At the Same Time [VIDEO]

Jack Stebbins has the interesting ability to whistle two different notes at the same time, check it out.

That is pretty damn cool.  I'm a notorious whistler, but I don't think it would have ever even occurred to me to try to harmonize with myself.

Is he really the only guy that can do this?  Is there anyone else that can?  I need to know how!