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Now the question makes more sense. Two ways - accidentally looking into the barrel and it going off, like during reloading. Or the most likely, ricocheting off a surface and flying back toward you (which is what happened in the movie, broke his glasses. Good lesson on protective eyewear, something that I think is worn in gun shooting ranges for that reason).
When I got my BB gun AGES ago, the first thing my dad did was teach to pick good targets that won't do that, that will absorb the velocity, and even made a cardboard box with newspaper inside to put a target on (bonus, most BBs didn't leave the box and I could recover them).
Yes, gun ranges typically enforce safety wear for eyes and ears at a minimum, on top of the 4 universal rules of use:
Treat all guns as if they are always loaded (meaning a round of chambered in the barrel, don't some is empty because you to the magazine out).
Never let the muzzle (exit) point at anything that you are not willing to destroy.
Keep your finger off the trigger until your sights are on target and you have made the decision to shoot (this is the most commonly abused or misunderstood why, you don't want to accidentally pull the trigger and shoot something you don't want to. People think they're being careful until they're not. Boom)
Be sure of your target and what is behind it. (This is also important, because in a home defense or self defense scenario, we always talk about what if your round were up pass through the bad guy and hit a good guy? Or worse, a kid! This leads to using/carrying the appropriate type of ammunition to mitigate that)
Sorry for the misunderstanding but it's hard to put all that into a sentence and a half. And most people see the title don't read the body. Leave a snarky comment and move along.