Three lines of dialogue in an otherwise harmless novel, published 1938, that made me suddenly keen to make sure no-one was reading over my shoulder.

Spoken by the hero:

'That's what comes of emancipating the wrong type of female. For a thousand years they breed a species to need a keeper and then they let it off the chain and expect it to behave.'

By another character:

'These government fellows, they wouldn't stand me for ten minutes if it wasn't for one thing. Do you know what it is? I'm a genius with my niggers.'

And, most strikingly of all, by the hero again; to his sister:

'What you need, my girl, is a good cry or a nice rape - either, I should think.'

For the record, his sister finds this annoying, and replies 'witheringly'. Cuh. Some people'll take offence at anything...