You often hear that Easter is "a pagan holiday." This claim is made, variously, by some Christian Fundamentalists (who want to do away with or re-brand Easter), by some atheists (who want to undermine Christianity), and by some neo-pagans (who want to undermine Christianity and claim Easter for their own).
People advancing this argument will argue that rabbits, eggs, and other symbols associated with Easter are fertility symbols--and we all know that fertility symbols are a dead giveaway for paganism, right?
They'll also say that the very name "Easter" is itself a giveaway--that it's derived from the Mesopotamian goddess "Ishtar." (Hear how her name even sounds like "Easter"?)