Very similar to Line Up, this game involves lining up in a given order, but with a twist.
Cover everyone's eyes with a handkerchief or blindfold. Once everyone's eyes are covered, announce to the group they have to organize themselves into a line in order of surname (alphabetically). Sounds simple but it is a good way to get people to understand the difficulties associated with not being able to rely on sight to communicate.
You could also try variations such as lining up in order of height, age, etc