An anagram is a word or phrase made by transposing or rearranging the letters of another word or phrase.

This one's amazing: From Hamlet by Shakespeare

To be or not to be: that is the question, whether tis nobler in the mind to suffer the slings and arrows of outrageous fortune.

Becomes:

In one of the Bard's best-thought-of tragedies, our insistent hero, Hamlet, queries on two fronts about how life turns rotten.

And the grand finale:

"That's one small step for a man, one giant leap for mankind." -- Neil A. Armstrong

becomes:

A thin man ran; makes a large stride; left planet, pins flag on moon! On to Mars!