The way it works is we get a weekly prompt and we write something about it. We read these aloud to the group, laughing and enjoying one another's work. After that, we pass a bag of words around and each pick five random words from the bag. Once we have them, we compose a paragraph or sentence using the words we've chosen. We get some pretty crazy results.
I attended another writing group a couple years ago and they did something similar. Instead of five, they chose ten words. We were given 15 minutes to write a short piece using all 10 words. The following is what I wrote. My 10 words were: 10 words drawn were: nightmare, explode, toe, pocket, sharp, young, surrounded, either, return, pull. See if you can spot them below.