I always giggle when I watch Star Wars and I hear Yoda.....I keep waiting for him to go into the near and far sketch. Don't get me wrong, I love Star Wars, but Yoda does sound like Grover a little. I think most of the characters that are voiced by the same person have similarites in the way their voices sound. I think that's a good thing. Like a trademark, almost. No one will ever be able to do a voice exactly like someone else did.