Have your class or family stand at the bottom of a staircase and you are at the top. Challenge any one of them to find a way to get to the top of the stairs without touching the stairs or the rails or the walls. Tell them there is a solution. If no one figures it out, then go to the bottom and have someone piggy back on you and carry them up the stairs. The lesson in this could be several different things. Teamwork, service, doing for others what they can't do for themselves, our missions in life are to help and lift others. The other message is the mission of Jesus, how he is the one to carry us up the stairs, we can't do it ourselves. That's what grace is; what the atonement is.