Ok, so I was thinking, your not on the right ways with a lord/king and your sick off them, maybe challenging them to a FIGHT TO THE DEATH. The loser dies, (If the player then the game ends).
Also, if you have 2 lords/kings in your prisoner hold, making them fight to the death for your amusment.
The first one would GIVE honour to the player for winning the duel but the second you would lose a lot of relationships with Clergy, Nobles and other factions.
Thanks
Toby