[Death by Grinding Stone]

I've been reading the book of Judges and theres one part in it that got me wondering. In the end of chapter 8 Gideon dies and in the beginning of chapter 9 his son Abimelech becomes king. Ok...it's not so much all that,but just one thing that turned the cogs in my head. Ok, Abimelech ended up murdering his brothers right? All seventy of them to be exact...so heres the thing, he murdered them with a stone(verse 5). My question is...how big was that stone dude? I know it probably sounds like a crazy question,but that's the kind of stuff I sometimes think of. Really...was it small, medium, or large? Have you ever thought about that? Yeah, I know I'm probably the only crazy one to think this, but the real kicker about me writing all this is how Abimelech himself dies. After Abimelech's brother Jotham escaped death( from his own brother by the way) you can imagine that he was pretty ticked off. I mean, why was Abimelech made king anyway? There were all kinds of questions being asked as you can imagine. So, anyway...heres were I'm getting at. The death of Abimelech was...by way of a grinding stone! That's the way some versions of the Bible describe it as.(NCV) A grinding stone folks. In the same chapter verse 53 a women dropped it on his head from a roof in a tower she and others were in. DOINK! While seeing stars for a brief moment, it ended up crushing his skull big time. What are the chances of that? He kills with a stone... and dies by a stone himself. That's were all this is going. I guess you can say he had it coming(verse 56). Peace out!