Once I was changing a Circuit Breaker in a transformer building for a small town. The short version is that the 19 mm socket somehow came of the ratchet extension I was using. I was DONE. Just trying to withdraw my tools and self from a place I did not really want to be. The socket fell off, and bounced twice. I can distinctly remember seeing it bounce. The was the last thing I remember seeing, for a while. The socket made its home between L2 and L3 buss bars. Popped both 480 Amp fuses and turned daylight into a super nova. I was blind for 30-45 min. As my sight began to start to come back, everyone who had this great idea to this work without shutting down the town, had urgent things to accomplish someplace far away. I was killing mad.