Here is a perfect example. Listen to the lyric of this at 4:29. No one would ever guess that as a password especially if you replace the spaces between the "words" with a meaningful number.

So Humala bebuhla zeebuhla boobuhla Humala bebuhla zeebuhla bop

becomes

Humala3bebuhla1zeebuhla4boobuhla1Humala5bebuhla9zeebuhlabop