My very strong-willed 2 yr 10 mo. old son is curious about everything in his environment, which crops up as a problem now and then if something delicate, expensive, or dangerous comes into it. Eye glasses, cell phones, computer electronics, tools...
He'll take the item and start examining it; sometimes this . Invariably an adult will cry out, "Put that down!" or similar, but rather than obey his instinct is to hide the object behind his back and/or run away. Then, if chased, he throws the item (discarding the evidence of his misdeed?)
I'd like to hear if other parents have had this problem, how they dealt with it effectively?
[Update] So what I've taken to doing these past couple days when he takes something is, "Oh! , do you know what that is called?" This gives him pause. "What?" Then I tell him the name as I move closer to him. "Do you want to know where that goes?" I put my hand on his shoulder or back (just in case). "Yeah!" Then with my other hand I point to a specific spot on a table or desk. "That goes right here." Then when he puts it down I give him a "Good job!" or "Thank you!" and either pick him up or give him a hug. This has been working well so far.
As per some of the suggested answers, when new things come into the house I'm also going to try to proactively give them to him to look while I can supervise him, on the theory that once his curiosity is satisfied the danger will lessen.