"Even though I've told you ten times I don't want to sell that watch, you
are such a nudge, I'll sell it to you."
When you want someone's object so badly that you force them to give it to
you, and according to most commentaries even if you pay for it, you have
violated "Thou shall not covet" (Shemos 20:13-14) of the Ten Commandments!!
Understanding what really belongs to us and what really belongs to others
is quite critical to our success in Judaism. It also prevents the
inevitable blurring that results from coveting that which is not one's own.