On the internet, there are a bunch of cool images. Most people are fine if they are spread and displayed, should the proper permission and bandwith be in play.
However, there are those who display images on their site directly taken from another site, "Hotlinked" or "Inline Linked", using the other site's bandwith without permission for their own purposes. Of course, when the home site find this out, it's quite easy to change the image to something else. Hilarity Ensues
. Usually it's just changed to a warning against using images/bandwith without permission, but sometimes, snarky pranks or Shock Site
This is why we have the Image Uploader