Hmm, poison. An interesting take on things. Not the way I interpreted it, but then again, you are the author... though I suppose by this point it's as much anyone else's to interpret as it is yours. I just thought he gave him Mad Agnes (a blessing and a curse) for managing to amuse him and play such a great joke on the unwashed masses.
You know, Uncle Boom isn't actually all that bad. He actually had a bit of a generous spirit, so long as whoever is on the other end doesn't annoy him or act above their station. You remember the early episodes, don't you? And consider the case of Button - Boomy treated him rather well until he decided it was worthwhile to betray him.
He is indeed a fine chap as long as people don't presume to be alone themselves. And if they are loyal then he is too. I think he is a smashing chap!
I actually didn't know which I preferred, at first it was going to be the bottle of piss that they had been using. Then I thought it would be Mad Agnes. In the end I left it ambiguous so that anyone could decide.
I liked button, I liked his recruitment!