In this game you need to finish the sentence started by the previous poster. The end of the sentence then becomes the start of the sentence for the next poster.
For example:
When it rains, it melts the witches
When it melts the witches, it upsets the flying monkeys
When it upsets the flying monkeys, it rains poop
When it rains poop, it ruins my umbrella
When it ruins my umbrella, it... and so on.
OK, I'll start:
When it starts, it...