You might know that Pope Francis has promoted devotion to Mary "Our Lady Untier of Knots". The Human Knot game is a fun activity to add into a teaching about this devotion. Since it is a cooperative game also makes a fun team building activity.
This game (sometimes called "spider web") uses a ball of string to create a tangled mess. It is often used as an icebreaker. It can also be used as an example of how sin can create a tangled mess in our lives.