I'm sure we tossed some crazy shit at eachother. But the craziest thing I've seen a sibling through and land was back in high-school my best friend fired an 8 ball off his brother's head as hard as he could when they got in a fight playing pool. Luckily it was not a direct hit because I thought he killed him with just a 45° impact. Knocked him out for a few seconds.

Scary shit. Scared the shit out of my buddy and he was the one that did it.

Horrible sound at impact.