Me: What does a milkman bring?
Grandboy: Milk
Me: What does a mailman bring?
Grandboy: Mail
Me: What does a fireman bring?
Grandboy: Um
Grandboy: Fire supplies!
Me: What kind of supplies?
Grandboy: Um. Hmm. Ah! Water!
Me: So we should call him a ‘waterman’.
Grandboy: Yes! We’ll call the waterman in case of fire, because the fireman will bring fire and burn down the house!
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I’ll save the discussion about ‘garbageman’ for another day