Just a bit of FUN! It was supposed to be a serious tutorial - but turned into watching Dr Bosi try to go on explaining physics when he "wazzent fellin da best" : )
I think will get someone else to do his stunts when there is rotational motion involved !!!
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<bdo lang="en" dir="ltr"><a href="//commons.wikimedia.org/wiki/Commons:YouTube_files" title="Commons:YouTube files">YouTube</a>: <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=rRSAMTXgoow"><bdi lang="">PH ME RM TUTE 70017A V0739 Spinning Chair Conservation of Angular Momentum</bdi></a> – View/save archived versions on <a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://www.youtube.com/watch?v=rRSAMTXgoow">archive.org</a> and <a rel="nofollow" class="external text" href="https://archive.today/https://www.youtube.com/watch?v=rRSAMTXgoow">archive.today</a></bdo>