In my story 'Panem', Clark says "damn" and "dammit" several times, but it's in high-stress situations. Some of the OCs, however, are a bit more willing to use strong profanity, though I haven't spelled any of the words out completely. (One character got halfway through the 'f' word before falling asleep at the breakfast table.)
"Oh, you can’t help that," said the Cat: "we’re all mad here. I’m mad. You’re mad."
"How do you know I’m mad?" said Alice.
"You must be," said the Cat, "or you wouldn’t have come here.”
- Lewis Carroll, Alice in Wonderland
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