One person starts by saying, “I am going on a picnic and I will bring some...” The next person repeats what the first person said and adds something of their own. Continue adding until it gets too difficult to remember everything. For example,
I am going on a picnic and I will bring some fruit.
I am going on a picnic and I will bring some fruit and some ice cream.
I am going on a picnic and I will bring some fruit, some ice cream, and some bread.