from the UK here we watched this for our geography lesson the teacher was doing actions to it and when i done it i hit some girl in the eye next to me haha :)
My teacher put this on for geography! We looked at her like...You what? She told us people did it in the exam and the other looked at the person like wtf?
We just did this in class and Miss had it on so loud about 3 teachers came in to see what was going on then did a kung fu show at the front of the class