Set up a 3 rows of two chairs. You can set up as many additional rows behind these. Have the group pair up into twos and sit down on the chairs, interlocking arms. Select two to be conductors. They need to find two seats. To do this they will call out something like “whoever has earrings on” then anyone with earrings will have to get up and find two new seats with their partner. Arms must remained locked at all times. Then the partners left without a seat will become the new conductors. At anytime the conductors can choose to yell out “Train Wreck!” This means everyone must get up and find a new seat. Gets a little rough but the kids love it. Works great with a large group of 30 or more.