Once, long ago, I saw this girl go by.  I didn't stop and talk to her, and I've regretted it ever since.

"M.C. Hammer Slide", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Once, long ago, I saw this girl go by. I didn't stop and talk to her, and I've regretted it ever since.