Lay a sheet or blanket down on the floor. The person doing the challenge must stand blindfolded at the edge of the sheet, holding a scrunched up piece of paper. Sneaking into the space, the other person must place a jar of jam somewhere on the sheet. The blindfolded person must then throw the paper ball as close to the jar as possible.
Closest throw to the jam jar wins!
You can use a measuring tape if you're unsure who has thrown the ball closest to the jam jar