Make slime in plastic Halloween cauldrons by putting 4 c. cornstarch, 1 cup water, 15 drops green food coloring in each cauldron. Mix well.
Form two teams. The first player in each group grabs some slime with his hands and runs to an empty cauldron at the other end where he glops it in, then runs back to tag the next kid in line. The first team to empty their Slime cauldron wins