Description
The word for "idiot" or "stupid" in Japanese, baka 馬鹿, is written with the kanji for the animals "horse," uma 馬, and "deer," shika 鹿. Since Japanese is traditionally written vertically, that means a horse on top of a deer, which is the wordplay featured in the image.
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File Usage
The file baka-horse-deer-umagon-gashbell.png
has been used in the following articles: