This week's quickest lock-in game
The exercise is: get a tent pole. Either grab one from an actual tent, or put together two tent pole repair kits, leaving out one segment.
Have people stand in lines on either side. They need to hold their index fingers out, alternating with the people on the other side of the line.
A person on either end of the line holds the tent pole just above the students' fingers while you give the instructions:
Rest the tent pole on their index fingers. Warn the students not to hook their fingers around the ends like the guy in white is doing. Their job is, working all together, to lower the tent pole to the ground. They must keep their fingers in contact with the tent pole at all times.
Usually, the first thing that happens is that the tent pole goes straight above their heads and stays there for a while. After they've tried their best for a few minutes, give them a new instruction: this time, they need to lower the tent pole to the ground. And the tent pole is very, very heavy.
You can interpret it by explaining that if we see the Christian life as a set of rules and things we have to do, it'll get really frustrating. But if we understand it as a relationship between us and God who continually reaches down to meet us, we'll worry about it less.
Usually it takes a long time-- my kids got it in 2 minutes this weekend.