I Yam What I Yam is the second Popeye theatrical cartoon short, starring William "Billy" Costello as Popeye, Bonnie Poe as Olive Oyl and Charles Lawrence as Wimpy. The source of the quote is the comic strip, Thimble Theatre by E. C. Segar, in which the character Popeye first appeared. This is a paraphrase of words spoken by Popeye in the comic strip.