Token
You take some bamboo and attach it together into a token of appreciation for your friend. Your friend greatly appreciates this token of friendship.
Imagine trying to attach some bamboo together into a token for someone.
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You hand over the token but your friend drops it and yells, "You fool (ふ)! I'm allergic to bamboo!"
Imagine the embarrassment you feel, forgetting they were allergic to bamboo. Oh well, it’s the thought that counts. You’re still a fool, though.