Can Someone Explain To Me How High He Is?

I just found out that Alex Chilton was 17 in this video. Amazing -rough in all the right spots- voice that he's got going on for being so young...

Just how high are The Box Tops in this video? Someone mentioned online that they seemed to be on Quaaludes. I wouldn't disagree with them :)

I love when the keyboardist shows us the keys and smiles at the camera, like "see? yeah...cool..."