In the late 1980s, Ron Hardin ran a lot of text processing on the Cray at Bell Labs. Among the more trivial things he did was build an insult generator.
This insult generator is not a bad source of passphrases, if you are feeling both erudite and cranky. Each is derived from the local machine's /dev/random source, and I do not monitore the results, I promise. The phrases contain about 42 bits of entropy, and are almost certainly office- and kid-safe. The link below will generate ten fresh insults for you.