"These annotations are then used for performing context checks or are passed on to subsequent modules, for example to aid in code generation." -- Modern Compiler Design, Grune et al.

The meme says:

Grab the nearest book.
Open the book to page 23.
Find the fifth sentence.
Post the text of the sentence in your journal along with these instructions

(watch how it is spreading on the blogsphere here or here)

via John Shute's Weblog

P.S. I'm not proud to be reading a book on writing compilers on a Sunday.