When a web page or image is in Google's cache after the page/image is deleted, and it's only trace can be found through google.
This often leads to frustration when someone is looking for a specific page or picture, you'll see a sample of text or a shrunk image that looks like what you want. Then you click to see more/full size, and you get a 404 error.
Guy1: Hey did you print that hi res picture for me like I asked?
Guy2: I can't, not even Google Remembers it!