Words from Sam

I was whistling while I was knitting. I guess I don't whistle much since Sam was impressed by my ability.
"Mom! You can whistle..........with your mouth!"

Huh? I was genuinely perplexed.
"Honey, what else would I be whistling with?" I asked because I just had to know how he would answer me.

He looked at me with that "oh you poor foolish woman" look and he sighed at me.
"With a whistle." he answered. The boy is convinced that his mother is daft.