Renfield is in an appropriately dingy Victorian asylum, where people who handle the inmates wear cages on their heads. Just in case. In Coppola's version, Renfield previously held Jonathan Harker's position before he went mad, or was driven mad by his boss' demands. Now he snacks on bugs and worms and wears a pair of most excellent and inexplicable articulated sort of hand braces that's oh so steampunk.
Dr. Jack Seward, the unfortunate asylum shrink, toys with Renfield a bit after noting, "I shall have to invent a new classification of lunatic for you." He points out that spiders eat flies, birds eat spiders, and cats eat birds, which causes Renfield to kneel on the ground and pitifully beg for a kitten.
"Oh, yes. A kitten. I beg you. A little, sleek... a playful kitten. Something I can teach. Something I can feed. No one would refuse me a kitten!" He would also settle for a cat. Obviously, he is not given a kitten or a cat, because he would probably eat it.
Enjoy the clip after the jump. You can watch the full movie for free at Crackle.com.