What's with all the global noises?

i think the latter is a good answer... i get a lil freaked if i wasnt watching the mini map and a noc ult's or a sion whos been roaming....

For clarity.

If a Sion is coming for your booty, why shouldn't you be aware of it in terms of possibility?

Sometimes, when my sound is a bit high, it freaked me out so much I almost jumped off my chair. At first I didn't even know that it was Sion's ult and I was like "what in gods name is causing this annoying noise?" But now I do and I find it pretty helpful actually. Whenever you hear it, you better make sure you're not in the middle of the lane or you risk getting crashed upon. You don't have enough time to react when he's already in vision range, so it's pretty important to get a warning. On the other hand, this can also be used psychological to scare the enemies away from lanes when you're not even there. (Like TF ult)

Also, Sion isn't the only one. When dragon is killed there is a global sound too. And also, for some reason, there is no sound for baron...

One time I had headphones on and the enemy Rek'Sai ulted... it hurt my ears and scared me lol