Exclamation Point Whistle ?

[hawkman]

My wife is watching a New Zealand police Detective show and I am not paying much attention to the show till I hear the male Detective whistle . I ask my wife why did the Detective whistle and she said the Detective found some sunken treasure that had been hidden . I told her knew it something very note worthy because the Detective whistled , my wife laughed at this .

I asked my wife what kind of sound does a woman make when they see something very note worthy ? She has not answered my question yet .