Oh I don't doubt that with the appropriate among of force one could very well drive a needle through a penny. Whether I'm able too or not, I mean... How am I to set it up so that the penny is secure and has somewhere for the pin to go? I guess sit it on a piece of cork or something...
Regardless, I definitely think it's possible to propel a needle through a penny or a quarter, but in order for the paper to go through the rock it is going to have to be substantially more dense, if I'm not mistaken.












