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Start a notebook. Jot down ideas like that, let them ruminate and meet up with your other ideas and have idea babies, and then when you're stuck for inspiration, read through the notebook. Or, ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/4726 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Start a notebook. Jot down ideas like that, let them ruminate and meet up with your other ideas and have idea babies, and then when you're stuck for inspiration, read through the notebook. Or, yeah, if you have a story that goes with your line, you could use the line as an opening. But that means that you're more or less stuck with that ironic, detached voice for the rest of the piece, and I think that would be really hard to pull off. I'd love to read it if it were done well, but it would take a strong stylist to pull it off, and I get the feeling that you're pretty new to the game. You could also try to have one of the characters use the line as dialogue. A joke told at the start of the story that becomes more and more meaningful as the events of the tale unfold. If you felt the need, you could have it bookended with a repetition of the joke at the end - perhaps through the bloody teeth of a character dying because he, too, was a naked pineapple. Or whatever. Again, pretty challenging, but brilliant if it worked. I'm thinking Tarrantino-esque. Good luck with it, and have fun!