Whistling

I can whistle ok, but I'm not the best whistler ever. My Dad was a great whistler! He used to whistle a lot, especially when he was doing little jobs around the house. It seemed like he whistled when he was happy. My Dad had a special whistling trick -- by moving his tongue rapidly inside his mouth, he could warble between two notes a third apart. It almost seemed like he was whistling two notes at the same time! For years and years I tried to do this! But, I couldn't! One day, when my Dad was visiting us, he sat on the front steps with my daughter, who was about 7 at the time. He showed her how to do that special whistle one time (ONE TIME!) and she learned it immediately! I am really jealous of her.