Can't interest them in facts baffle em with bull sh!t.
As far as I know MS still holds the patent to smiley faces, the fact they have been around since the keyboard made no difference..
A rock "rolling" downhill has the same features of a wheel, when it hits and kills someone can I patent a new weapon?
I'll make much mention of the fact it was revolving to maintain accuracy.
A sling doesn't require a rock/stone to spin, in fact can't really pull it off.