One day, I noticed something made of plastic under Sam's shirt.
What is it? I asked.
It's for my back, said Sam bluntly.
Is it bullet proof? I asked.
No, I don't think it can protect me from a bullet, said Sam disappointedly.
To soothe Sam's feeling, I said "It's okay. I think it can shield you from a knife though. Guns are hard to find but knives are common you know".