Creative writing - caption creation

Automatic creation of captions for an image if the person didn't tag their image. The captions should be up to 40 characters, and generic to fit any type of picture. Examples of stuff people are taking pictures of: buildings, cat, their food, their palm, bar/restaurant, their beer, dog, office, laptop, street, their watch, their shoes, billboards, etc. The captions should refer to the content of the image rather than to the "quality" of the picture, or to the picture creator. Here are some examples of such captions: Hands off! I called dibs. Not for sale. Untested prototype. Some things are better left unexplained. No comment. This is the only thing I will take with me on a deserted island. Must own it! Not for human consumption. Ugly… For sale What do you think would happen if you microwave it? For how much do you think this would this sell on eBay? I wouldn't touch that without gloves. Who do you think touched it last? Errrrr…Too much bacteria… Will it blend? My favorite! Bad examples: - great picture - refers to quality, not content - you should take more of those - refers to quality, not content - you are a great photographer - refers to quality, not content - I wonder how it tastes - not generic, can’t fit a photo of a cat - this shoe is stinky - not generic - I like your photos - refers to the picture creator