I remember an old Guitar Player article called "Is Shred Dead?" from right about the time Grunge peaked during its short moment in the sun.
One of the banned behaviors (going forward) was the "Oh, I'm Squirting Now Face", which was one step beyond the "What's That Smell Face", which only a few legends were still approved to use, such as a B.B. King, etc. Steven Seagal was NOT authorized to use those faces, but he did.....and we were all lesser for it....