He keeps himself alive by drinking the blood...
7 seconds sound clip from the Abbott & Costello Meet Frankenstein movie soundboard.
You can hear this line at 00:14:50 in the Blu-ray version of the movie.
Quote context
[...]
- You don't know what you're talking about! You're all excited reading this legend.
- Now, listen to me. McDougal will be here any minute with the insurance agent. Now get to work!
- He keeps himself alive by drinking the blood...
- Chick!
- Now, listen, this is getting to be ridiculous.
- What? What? Are you trying to tell me that candle moved? Look, wait a minute. Candles can't move!
- Yeah, there. Watch it. Keep your eye on it. Is it moving? Huh? It's not moving, is it?
- Not now.
[...]