I definitely remember this one.

There was a joke involving how people could get, "bun energy" and one of the things it would do is give you bunny ears. Something something, Fenton being like one of those anime girls that had the toast in their mouth when they were late to school. I don't even think people remember those shows anymore, but they were well known back then. I'm old.

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Fun Fact: He is so kawaii.