So basically, here's a run down of how we might be able to make this work: come up with a funny, amusing, fitting caption that goes with the image posted... considering that there isn't a whole lot of activity, I say that every third person posts a new image to caption, not counting the person who posted the image... for example:
Original poster: Image, caption
Poster #1: Caption
Poster #2: Caption
Poster #3: Caption, new image, new caption.
Like that.
Let's get started:

"Gee, I wonder if there's any of that chocolate cake left back home..."