I found this comic extremely funny. The title of the comic was “A-Minus-Minus.” (Click either of these comics to go to their source.)

And the caption that appears when you mouseover the comic is “You can do this one in every 30 times and still have 97% positive feedback.” What a riot!

For the more esoteric among you, here’s another ebay-related comic, which was created in response to the one you see above: