I could be wrong, but I THINK I remember from that book How to Win Chinese Friends and Gain the Admiration of All Peoples:

Tip 94: Memorize famous poems about Chinese holidays.

Every year when Qīngmíng Jié 清明节 rolls around I've always thought about (and then promptly forgotten about) memorizing this little poem.

Well for whatever reason, after years of not doing it, I've finally decided to commit it to memory. With the Qingming holiday and the accompanying "Bǔkè 补课 Bonanza" fast approaching, I've only got a few days to recite this to as many people as possible (no good doing it AFTER the fact, you know).Go ahead. Quiz me on it next time you see me.(The full text and English translations are here.)