There are some amusing apps which read the MacBook's lid angle sensor. I remember one of them played a creaking noise through the speakers when you open or close it... Somehow I doubt App Store review will let that in for the Duo, but we can always hope.

I still remember when people realized the MacBook had a sudden motion sensor and used it to make lightsaber noises:

https://osxdaily.com/2006/12/06/macsaber-turn-your-mac-into-...