Me in my Kingdom of Italy game:
Adviser: My Lady, your revocation of lands from the rebel nobles and the ransom of their courtiers has been completed. The war against your right to absolute rule has been costly, but with your vassals either in adoration of you or safely in your dungeon, it can be said that none of your forebears had the same level of control over Italy as you have. The Council is ready to make itself totally feeble at your command, you just need to request the vote and it shall be done.
Me: Hmm, I am starving. Where is Duke Stefano?
Adviser: Ahh, the traitorous duke is rotting in his cell, lamenting the loss of his lands in Italy. Might I suggest you gift his vassalage to the Kaiser, it will prove to all your generous and loyal nature and we will never be bothered by that bloodline again.
Me: Well, that's a good idea, but this cookbook I found gave me a thought on what to do with Stefano. <pulls out the Necronomicon>
Adviser: Ummm, My Lady, my I ask what it is you are planning?
Me: My oath was to be loyal to God and Kaiser, dear adviser, but I live to serve Man. Now, have a spit assembled in the dungeon by the evening. And bring the spices!
It's probably good that I was in my 50's by the time I did this, so I won't have to spend too long with a -50 opinion with everyone else in the game. I honestly didn't expect any bad repurcussions, as he wasn't even the first person I ate (the previous victims being 2/3 of my previous husbands). I suppose doing it during a carousing makes it have Plausible Deniability.