PVC Plastic Pillow Tapping (Whisper Intro)

This video has "deeper" tapping sounds made by tapping on a pillow covered in a rather firm PVC/shiny type of plastic/vinyl cover.

No, I am not a NASCAR fan. It's cool if you are, but I'm not. I found this pillow at Goodwill and only bought it because I liked the sounds it made when I tapped on it.