There haven't been many, that's for sure, but the one that springs to mind is "Roadtrekking" by ML Thompson and Gerry Ankelwicz  PJ (who hopes she spelled Gerry's name right!)
"You told me you weren't like other men," she said, shaking her head at him when the storm of laughter had passed.
He grinned at her - a goofy, Clark Kent kind of a grin. "I have a gift for understatement."
"You can say that again," she told him.
"I have a...."
"Oh, shut up."
--Stardust, Caroline K
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