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
bachelor party
party pooper
pooper scooper
ice-cream scooper
ice-cream float
float plane
sea plane
sea monster
monster mash
mash game
http://www.espin.com/mash-game.php
game time
game over
sleep over
sleep tight
tight fit
fighting fit
kungfu fighting
fighting talk
fighting words
two words
two seater
two player
player one
record player
world record
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