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
earth hour
witching hour
bitching witching
Always bitching
unconditionally always
Unconditionally surrender
surrender chocolate
Chocolate drink
chocolate milk
Milk shake
milk soya
got milk
permeate milk
canned milk
canned gas
Natural gas
natural progression
Slow progression
slow down
Slow burner
slow song
Sing song
Sing sing
can't sing [for nuts]
sing along
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