You may not notice because the process has happened slowly, but when you watch back-to-back clips decades apart, you can tell little things like inflections are definitely not the same.
People who voice these iconic characters actually have to make a choice.
But apparently, because the line is iconic and because there really are multiple iterations of the voice to choose from, Bob Bergen finds it to be a major challenge.
It’s sort of amazing to think that the hardest part of playing a character might be tossing out one of the character’s most famous lines.