I've just started watching this series and it was love at first sight (I'm obsessed with Victorian England and the supernatural). It was strange, dark and depressing, and a little disturbing in places...it spoke my language. Now, don't get me wrong, Alucard from HELLSING has my loyalty for all eternity and beyond...but Sebastian has my loyalty too. I'd sell him my soul.
THIS IS PROBABLY THE BEST THING EVER BECAUSE IT IS LIKE A REVERSE JOKE i.e. my original assumption with the phrase "Do you need a knife?" is a knife that can be used as a weapon; and the joke of it is the knives in question are table knives, which are regarded as harmless. Therefore that could have been the joke. BUT THIS IS SEBASTIAN and table knives are pretty much his weapon of choice, therefore the joke has gone full circle in my brain and it's great.