Never. And I thought it was horribly ugly when other kids did that.
As for me, I wrote on mine with a ballpoint pen. My name, and then little drawings. Owning it was important, not killing it. I also liked the smooth feel of the pen on the rubber.
I loved all my school supplies, and I still love stationery stores. Paper of all kinds, pencils, pens, crayons, markers, rulers, templates, the works. And rubber erasers. Pink Pearls.
So no, I don’t think it’s a hereditary instinct to stab it. To mutilate it, though, maybe. Perhaps it resembles some small life form that was a pest or a danger to our remote ancestors?
@Patty_Melt, I did the same thing with the Elmer’s glue. I did it at home, though. No reprimand.