Mel Blanc did a lot of voices in his lifetime. I've seen him doing them in old interviews, and even though I know who he is and what he does, I still can't help thinking, "Wow, he does an excellent imitation of Bugs Bunny."
But I've never seen him doing them like this. This is apparently a genuine video of his larynx as he vocalizes. I have no idea if the larynx looks enormous compared to others or what, but it's got a little bit of creepy fascination to it.
But nowhere near as much as this. This guy has a few videos up on YouTube explaining what it's like to have an artificial voicebox. No video, just audio, but they're quite interesting listens. In no small part because the guy's got a pretty good sense of humor.