greyson the intruder for my class

Ok so here’s my idea for when Greyson comes into my class- I’m calling on the creativity of the rest of my family.  The objective is to teach students about eyewitness testimony and see how accurate they are when they aren’t prepared for such an event.  Greyson would come into my room in the middle of a lesson/lecture—dressed in normal attire- jeans or pants and shirt and carrying an empty back pack- but grasping a bloody set of scissors- behind his back most likely-  and having some blood like substance on his shoes.  I’m thinking even a good fake mustache at this point would be cool….and he asks me if he can use my dishwasher- and I will say sure..Then he will go into my prep room- start up the dishwasher and take off his first set of clothes- underneath would be some athletic attire- shorts and T-shirt and gym shoes- he would stuff all his outer clothing into the back pack, place the scissors in the dishwasher and start it, remove the mustache- then come back out (you have to leave an enter the prep room through the classroom doors)- so he would leave…saying thanks or something afterwards.  I’ll also have the unusual phone calls and things on the white board again this year from my other staff members.  What do you think Greyson?  And any other clever ideas from my family?  Oh and as he leaves he drops a wipe in the garbage can- but the classroom door- that he used to clean off some dirt that was on his face- or the blood on his hands- whatever.  The wipes are in the science prep room..but the garbage can is by the exit door in the classroom.