Yeah, there is a story to it.
I was told off at a jam session for rolling my eyes and raising my eyebrows at a guest vocalists singing, chanting and howling.
The guest was American Indian, delivering traditional vocals over rock/blues improvisation.
Touring these days as 'Sons of Cream', it was one jam session of a few I did with Malcolm Bruce and Kofi Baker. 1991
I probably have a cassette recording of it too, somewhere.
I have never forgotten how he told me off.