An interesting story from Ars Technica on the security implications of grammar in your passwords:
…a password composed of “pronoun-verb-adjective-noun,” such as “Shehave3cats” is inherently easier to crack than a “noun-verb-adjective-noun” passphrase such as “Andyhave3cats”. A password that incorporates more nouns would be even more secure.
(Unrelated: every time I see “Ars Technica” I think “Arse Technica” and laugh a little. Can’t help it.)