Seems like a deaf and dumb cat to me, but I guess it could have been curious and trapped behind something when the bit suddenly broke through the wall.

I also had an implausible story related to me by a telephone installer. It seems that a pair of installers measured, calculated, drilled, and drilled, until they had two feet of drill bit into the project and nothing came out -- nothing. Eventually they discovered that they had drilled up, dead center, into a grand piano leg.