Start with a list of dangerous things. Not just weapons (though those are okay, too), but anything which could turn dangerous, or has an inherent danger associated with it.
Guns, knives? Yes, but also cars, chemicals, chainsaws, rope, that rickety old bridge they made you cross at Summer Camp. The old hermit's house on the edge of town, where they say kids used to disappear. Live wires. Cellophane (thanks, MIke... I'll never look at it the same again). Butcher knives. Boxcutters. The building you work in.
Now, take a moment and think about all the ways it could put somebody in danger, or hurt them. Think about any possible safety lecture one person might give another about it.
What else can you associate the item with in your past, or the past of the speaker of your poem?
Write a piece that looks at the inherent dangers of the item. Perhaps they were taught how it works and what not to do with it. Maybe they're contemplating doing something with it, either to themselves or someone else.
What causes them to think of it in this way?
What questions might they ask of the thing, or what favors might they want?
Take a look at My Mother Contemplating Her Gun by Nick Flynn.