Need a simple UX game for workshop

I'm looking for a real world example of UX which can be used in a short workshop I'm running. I was hoping to find some sort of game where I could split the teams into small groups, give them a time limit to perform some simple tasks, then show the results.

My audience is mainly people who know very little at all about UX. Does anyone know of a simple, real world usability problem which can be described to the audience so they can think in a way related to UX principals? Ideally, I'd like to get them working in teams to highlight the need for collaborative thinking.

All ideas welcome. (Sorry if this question is a bit outside the norm.)