My naughty Tri color male goes around the house looking for any tiny bits of celephane, foil wrapper, metal staple what ever he should not eat. He comes up saying "I'm going to eat it, I'm going to do it", swishing it around in his mouth with him popping the object out once in a while.
He has me trained to give him a treat in exchange for the tiny object.
If I try to get it from him he runs away, I can't catch him, if I ignore him he eats it.
He tried it with my wife, she totally ignored him, he just dropped it and walked away. I tried the same and he ate it!
Remember consistancy is key, they know this as well.