Quoted from winteriscoming:DISCLAIMER: This T-REX is not invincible!
I think I've been pretty upfront about my accidental breakages so far.
Here's an impact test I did with a ball-peen hammer.
Back in good old RGP days it was shown that a pinball travels about 5MPH in a game (maximum speed). Using this calculator http://keisan.casio.com/exec/system/1224835316 I plugged in .25 seconds and changed the output to imperial. This showed that a object (pinball) dropped from about 1 foot would reach ~5.5 MPH.
It looks like you exceeded that force (a pinball dropped from 1 foot) a bit