Some of the uncredited voice acting roles for Mel Blanc are a little hard to believe...

...and try as I might, I can't find any reliable third-party source to confirm them. Now, under ideal circumstances, I might just trust that IMDb's editors know what they're doing and wouldn't have allowed someone to add these credits without providing a source. However, I do not have the greatest confidence in IMDb at the moment, for many reasons (such as a recent incident where somebody vandalized the plot outline for "King Kong" by replacing it with a stupid, unfunny joke, which somehow got past the editors).

A few examples of what I'm talking about with Mel Blanc:

Sleeping Beauty (1959) - Here, Mel Blanc is listed as "Samson the Horse" (uncredited). This one is actually more believable than some of the others I intend to mention, except that the only sources I've found to confirm this are on this wiki, which is fan-edited and hardly reliable. I remember a while back this very same voice credit was added and then later disappeared, and now has been added again. If this is authentic, where's the evidence?

What really strains credulity however, are some recently added short-film credits from the 1980s. I'll highlight two in particular: Luxo, Jr. (1986) and Tin Toy (1988). In both of these, Mel Blanc is listed as providing the voice for the title character. What makes this so hard for me to believe? Well, for one thing, as with the example mentioned above, no reliable source is available online to confirm this. But what's much more incredible is that anyone who has watched either of these shorts recently knows that neither of these characters speak (or make vocal sounds of any kind) at any point in their respective films.

In the entire two-minute runtime of Luxo Jr. (1986), not only do the characters not speak, but there is no sound effect even vaguely resembling a human voice (the characters make electronic-sounding noises when they move, that's all.) In Tin Toy (1988), there are crying baby noises, but the titular tin toy "Tinny" is totally mute. The only sounds coming from him are cymbal, drum, horn and accordion noises - hardly the sort of sound effects that would require a voice actor.

Why would Pixar hire the "man with a thousand voices" (who was definitely a household name by the 1980s) to provide mechanical/musical sound effects for non-speaking, non-vocalizing characters, and then proceed to not credit him for the work he supposedly did but that there is no actual evidence was ever done by anyone? It just doesn't make any sense.

When it comes to credited roles, obviously, we can just look at the credits. With uncredited roles, shouldn't the burden of proof be on the person adding the credit to show that this person really did contribute, and not on people like me to somehow prove that it didn't happen? Call me a doubting Thomas, but I think this is totally ridiculous and I highly doubt its authenticity.