People always think I am making it up when I tell them that Robert de Niro guested on Sesame Street and taught Elmo how to be an actor. This is a good time of year to take a little acting training to round out your Halloween costume, give it that extra spark. So here is YouTubian proof that I was not hallucinating when I saw de Niro on the Street. And also some nice tips on how to imagine and pretend, if you are dressing as a dog or cabbie on October 31st. Robert de Niro is very convincing as a good source of riboflavin.