Here's an example from the Kokin shū of the "tiresome poetry, lower than punnery" (しやれにもならぬつまらぬ歌) that Masaoka Shiki 正岡子規 famously waxed caustic about.

The poem in question is number 239, in the "Autumn" section, and is by (Fujiwara) Toshiyuki no Ason (藤原)敏行朝亜. What you need to know in advance is that Eupatorium fortunei is called fujibakama ("wisteria [→ purple] trousers") in Japanese.

なに人かきてぬぎかけしふぢばかまくる秋ごとにのべをにほはす
Nanibito ka/ kite nugi kakeshi/ fujibakama/ kuru aki goto ni/ nobe o niowasu
What manner of man/ has removed and left here/ these purple-trousers?/ Every time the autumn comes/ their scent doth fill the fields

That's it. Toshiyuki no Ason noticed that the word fujibakama literally meant "purple trousers" and wrote a poem that says "hay guise i wonder whose trousers these were LOL." The fact that Heian noblefolks scented their clothes and so that final line isn't straight-up slapstick is important, but not redeeming. (I will quietly admit that I like the second line's angular, lively nature. But that's it.)

And of course there were replies, taking the conceit further, such as this one by Minamoto no Sanetomo 源実朝, who as third shogun of the Kamakura shogunate should have known better.

藤ばかまきてぬぎかけし主やたれとへどこたへず野べの秋風
Fujibakama/ kite nugi kakeshi/ nushi ya tare/ toedo kotaezu/ nobe no akikaze
Who was it/ who removed and left/ their purple trousers here?/ I ask, but it does not reply:/ the autumn wind in the fields

Note also that Sanetomo was assassinated by his nephew Minamoto no Yoshinari 源善哉 a.k.a. Kugyō 公暁. I'm not saying that there's a direct connection. I'm just saying. And let's all be glad that sakura weren't named "pink-trousers" or something, because if that were the case the Japanese poetic tradition would look very different.