I abominate the tomato hornworm (Manduca quinquemaculata). The caterpillars are enormous (up to 4" of undulating length), and the helicopter-moths (technically Hawk, Sphinx, or Hummingbird moths), are even worse, with a wingspan of 5 inches. I've had cats drag these monsters into the house and release them, forcing me to bring out my anti-aircraft weaponry to bring them down off the drapes. See more here
