Colorless green ideas sleep furiously - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Colorless_green_ideas_sleep_furiously
"Colorless green ideas sleep furiously is a sentence composed by Noam Chomsky in 1957 as an example of a sentence whose grammar is correct but whose meaning is nonsensical. "
Matrioshka Brain Home Page
http://www.aeiveos.com/~bradbury/MatrioshkaBrains
"A Matrioshka Brain is a megascale structure constructed at atomic scale limits."