Hyperion (Hyperion Cantos, #1)

by Dan Simmons

’Later, alligator.’ ‘Huh?’ ‘See you later, alligator.’ Rachel giggled. ‘You say – “In a while, crocodile,” ’ said Sol. He told her what an alligator and crocodile were. ‘In a while, ’acadile,’ giggled Rachel. In the morning she had forgotten.