If you can't whistle, there's a way to use an acorn or a bottle cap to do so. I can whistle, but not that loud, and often use a bottle cap to whistle loudly at

If you can't whistle, there's a way to use an acorn or a bottle cap to do so. I can whistle, but not that loud, and often use a bottle cap to whistle loudly at venues. https://youtu.be/tydJLavu8Fc https://youtu.be/tydJLavu8Fc