Prop: a half full tumbler of water (needs to be clear glass – not a plastic or paper cup).
If a younger child might be your volunteer, you may want to take steps in anticipation of a spill or the glass being dropped – such as a towel on the floor underneath to use in mopping up spills, and to serve as a soft landing spot.
You can begin the lesson by pointing out – in a humorous way – that this is not a lesson about “Is the glass half full, or half empty?”
Ask for a volunteer to come and hold the cup. Have them hold it at arm’s length, sideways to the audience if possible, so that the water level and any dip of the arm are plainly visible to the congregation.
Ask “How heavy is this glass of water?”
The Here and the Hereafter 