Many celebrities have been seen with Muppets lately. Besides the new 'Muppets' movie, Jimmy Kimmel talked to Abby Cadabby about siblings and many Muppets showed up on 'SNL.' Now we have Conan O'Brien visiting 'Sesame Street.'

O'Brien teams up with Abby and to teach kids about the word "amphibian." What happens next? Well, let's just say a Muppet Conan is one scary Muppet. Watch below to see a bizarre mash-up of Conan and Kermit.