Handy with a sword.
About 40 yrs ago we had a dojo in a large sports complex - we often saw the instructor watching our sword techniques - what we didn't know was, he had actually bought a sword and was showing his students `Karate` defence against the sword - he had memorised the Tenkan movement but had forget to take his arm with him, as his student attacked Shomen, he turned leaving his left arm outstreched - the sword was not controlled and continued to cut towards the mat - the Karate instructer had his left hand cut completey off.
Take one shinken and give it to a student inexperienced in sword.
Ask said student to strike you with the shinken.
Attempt a technique you only saw some one in another style do.
I'm surprised it ended badly