This troper did a Naga cosplay in 2007. She trained long to do the laugh with the proper ear-bursting, old lady-scaring effect. It worked.

You owe me a Yoo-Hoo.

This troper frightens her parents with this.

This (male) troper used to be able to do it, back when I was an adolescent and my voice was still trying to decide where it'd end up. It always freaked people out; sadly, my voicebox has lost flexibility since then.