Halloween is all about treats this year with the officially licensed Marvel Halloween Spider-Man Trick or Thwip Women's Graphic T-Shirt! The iconic "thwip" sound effect, or the noise Spidey's web shooter makes, is highlighted on this funny Halloween tee that shows off Spider-Man as a cartoon and reads "Trick or Thwip" in black across an orange background. Beware the spooky Marvel tee hiding under your bed this Halloween!