Indian Chief

I suppose this title is a bit politically incorrect. The other day big guy started doing his normal yells of joy and discovered that if he moves his arm up and down over his mouth, his yells of joy suddenly become really cool! Now we do a lot of talking while moving our arm. And he thinks it's really funny when I start to yell (quietly) and put my hand over my mouth a bunch of times, just like how kids pretend to be Indian chiefs.