There are four rules for safe gun-handling. Four. They all count, all the time.
We are all likely to violate one of them at least once. When ya do so, take yer correction and fly right. Whinging that, "It ain't loaded," does not count; even empty, it's loaded, 'cos you are no more perfect than anyone else. That goes double if someone handed it to ya an' you failed to check.
Hey, I know: let's ask the man who owns a gun store!
1. All guns are always loaded.
2. Keep your finger off the trigger until you are ready to shoot.
3. Never let the muzzle cover anything you are not willing to destroy.
4. Know your target, what's behind it, and what's next to it.
And once you've reached the point where you pick up an electric drillmotor* and your finger goes unthinkingly along the frame instead of onto the trigger? Don't relax; work harder on maintaining conscious awareness of what you are doing.
Hat tip to Say Uncle.
* I do not care how the hoi polloi say it, "drills" are the twisty-pointy things you put in the chuck of a hand drill -- powered or not -- or a drill press or even the tailstock of a lathe. Except when they are straight-flute types, but that's another subject. "Bits" have truncated tetrahedral shanks that fit braces or hexagonal ones that fit drivers/bitholders or cylindrical D-and-notch ones that fit Yankee screwdrivers, except for some antique types that use other tricks. Really. "Drill bit" is a horrid, horrid phrase that should be left out to rust.
CHICAGO RAILROAD FAIR, 1948
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