Hey, Lots of characters in legend of zelda don't actually speak words, despite the text boxes. Instead, they make short sounds like 'Hey, listen!!!' From Navi and Vaati's weird laugh from Minish Cap. My favourite has got to be Vaati's laugh.
Oh, the irony... it makes it even funnier. x)Hyaaaaah! That's scary! I know I'm scary, but...man! That's really scary!
I think the Happy Mask Salesman is creepy, but you do make a good point! But skull kid's incessant screaming is way worse, though.