Want to guess what makes the most annoying sound in the world?
If you're from Texas, it's made by a Giants' fans and not on the vuvuzela. In fact Rangers' fans aren't quite sure what sound is hitting their players when they step into the batters box.
The small little device looks something like a harmonica and it plays a note something like a fog horn.
Whatever the instrument is called and whatever noise it makes, it is sure annoying to opposing players. Check it out for yourself in the video below.