h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

My 3 year old son likes to ask cyclic questions (though I suspect that he doesn't actually know that he is doing it).
A typical bath time question will run like this (usually about once or twice a week):
“Where does the water go?”
“Down the plug hole”
“Then where?”
“Down the drain pipe”
“Then where?”
“In to the sewer”
“Then where?”
“It is cleaned up”
“Then where?”
“It is returned to the river”
“Then where?”
“It flows in to the sea”
“Then where?”
“The sun shines and evaporates some of the water”
“Then where?”
“It forms clouds”
“Then where?”
“The clouds move to the land”
“Then where?”
“The clouds then rain on the land”
“Then where?”
“The water flows in to streams, rivers and lakes”
“Then where?”
“The water companies collect the water, clean it and feed it in to the water supply network”
“Then where?”
“We turn on our taps and fill the bath with water”
“Then where?”
“We have a bath then let the water out afterwards”
“Then where?”
“I think we have already covered this, son!”
I am sure that he gave up listening to the answers after the first or second one, but you can sometimes throw in something silly (assuming that you don’t think the above was silly in itself) just to see if he was paying attention. It also stops him asking even more questions, which you have to actually thing about before answering, though I am sure that I still have those to come.