You know you’re having a bad day when you run a toolpath that was supposed to come “really close to the machinable limits”, but you forgot you also have a door on your enclosure with a nice strudy locking mechanism, and a large dust shoe and hose to take into account. The door won, the dust shoe and steppers lost, the dust shoe got knocked off to the side its magnet attachements, and in the second it took to hit the E-stop, I managed to…MILL THE FRONT LENS OF MY DUST SHOE CAMERA 
(melted plastic and shaved bristles for extra drama)
Anyway, I figured this belonged to the “Oops” thread.