Quite simple: I start off with 2 words. The next person keeps one of the words and replaces the dropped word with another.
Examples: Run fast
Fast cars
Cars rock
My word to start: Christmas holiday
golden arrow
golden fleece
fleece jacket
yellow jacket
yellow belly
belly button
button mushroom
mushroom cloud
rain cloud
cloud nine
nine holes
button holes
blow holes
blow hard
hard knocks
knocks twice
twice shy
shy Di
just shy
just cause
just great
great expectations
unrealistic expectations
Lowered expectations
raised expectations
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