but a pencil must be lead
Nice… I see what you did there 
Booooooo.
You’ve heard of spontaneous human combustion right…?
A couple of days ago while I was in the local supermarket, a woman next to me started screaming in terror - there were bright blue flames shooting out of her arm - nowhere else, just like, from her wrist to her elbow. Weird. Anyway, she tried, and failed, to smother the flames and ran shrieking outside. Luckily there were a couple of policemen parked on the curb just opposite the exit.
They did nothing except promptly arrest her however…
… because she was in possession of an unlicensed firearm.
:-"