Ultimate shoulder rides

I wonder how many shoulder rides there are going on in the brakes in school classes, school corridors, school cafeterias, school halls, school backyards or whereever on the school grounds. I assume there is a lot more action as we ever get to see through youtube and such videos. It would be interesting to hear about the experiences, the observations of teachers about this.
What are the personal experinces of members regarding this topic? Please reply in the Forum section stories, experiences and discussions under Shoulder rides in school.