I first heard about this from one of Ben Slavic's dvds that I purchased ages ago. I have since experimented with it in my classes.
While you could simply do it as a quiz or silly assessment with your students, I prefer the group activity.
My students on Fridays have PAT. So they already have groups. You could easily have them form the groups that day for the activity. Mine have to say a group chant and have a group name already established so that we can simply play this game.
So while I could have a list of every single word we have gone over for the year (or for years if they are in Spanish 2 or another level), I prefer this on the spot activity.
