So we used to do this at my old job, all it is is one person starts the story, then passes it to another who says a little then they pass it and so on and so on, the object is to keep it going as long as possible with out losing the main plot and with out letting it get boring/stupid.
Here's the first part.

So there I was, naked, In a freezer. I don't know how I got there, well I don't remember, but I'd like to konw.