I have a friend who goes to my college who is a major Sesame Street fan. I asked him if he saw the wicked witch episode, and he said yes. I asked him where he saw it, and he said he saw it on YouTube. I asked him to show me, and he showed me a clip of the wicked witch from The Wizard of Oz.
Now I suspect he's just making stuff up. I thought I could trust him, but sometimes people who you thought were genuine turn out to be fake. That's happened to me on a number of occasions.