I think that there should be a new mob. A Kidnapper. It spawns on grass(dirt)/sand/rock in the night/day. If it is within 50 blocks of you, it will come to you. It has a gun that shoots a net. It will catch you, or try to, and knock you out. You wake up on 5 hearts, and some of your stuff is gone. This being said, I am done.
Then it would hold nothing. Just the net.
But What will happen once he captures you? Are you in a cell? In a Cage?
But anyway like I said, what a good idea!