This remind me a less "funny" story
Years ago when I was involved in building nice small biplace chopper ( helicopter) we had in Italy some travel to an aeronotic show where these ultralight heli where on show and in demonstration ;
on a specific brand stand there was a lot of people and very crowdy all around the choppers touching everything so the owner upset decided in order to make one of these out of all this crowd to do a demonstration so he pushed forward the heli in the test area and started the engine and rotor and flyed up about 5/8 meter but suddenly the rear small rotor exploded and the heli was down !! completly smached and destroy , by chance the guy was safe !!!! some days after we had a phone call from this poor friend and he explained that after doing an accurate inquiry with Italian police they found inside of one rear blade rotor ( that was smatched and twisted) one metallic pencil !!!!!!( blades where aluminium foil bended to shape but open on one side !!!
The rotor exploded because of unbalanced ( mandatory balance was 3/5gr tolerances)
Public , crowd and one stupid guy with a pencil ( lost or .. not !!) and one nice heli destroyed !!!!!!!!!!!!!!!
By chance nobody was killed or hurted !!!





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