Hmm, and cuss words also work in KQ4, bringing up an easter egg about Leisure Suit Larry. They semi function in KQ1 SCI, but just shut down the parser, with no messages at all.
In KQ3, I think a few choice cuss words, gives you a comment like, "You were obviously raised by a naughty wizard".
In the original KQ1 cuss words were not in the parser, you just get the generic message, like "The system doesn't know what you are trying to say", which appears for any word not in the parser.