You shouldn't send someone gory pictures.
"Dave sees a tweet by another twitter user saying ""send me the 4th pic in your gallery"" which, in Dave’s case, happens to be a photo of a dead woman."
Dave wants to choose which other pic to send.
Dave decides to send a picture he has which contains a cat doing something cute.
Dave decides to send the picture of the dead woman and replies in a tweet with the picture attached.
The user thinks that the picture is cute and delightful and replies with a compliment.
The user who Dave replied to is disgusted and disturbed by the image she sees.