When I was 12 or so the police came to our school and set up a "shoot don't shoot" simulator. So I went through the scenarios and did pretty good, didn't shoot anyone I wasn't supposed to, shot the people I was supposed to. Then there was one simulation where this guy is approaching, I told him to stop several times but he just kept coming so I shot him too. The simulation continues and he pulls this card out of his coat that says, "I am legally deaf and dumb". So I shot a deaf guy.
I think the cops included that scenario to make us think and it did.