To Herd a Cat

By Dana Luery Shaw

Professor von Yipp experiments his groundbreaking new machine, using himself and his cat as the subjects.

Didn't Think This Through: Turns out the Professor had no foolproof way to switch back into his own body in case the machine malfunctioned. Cue him being trapped in the body of a cat.
They Called Me Mad!: Subverted in the story.
“They all said I was mad. Mad!”
He paused. Well... come to think of it, I don’t believe the word “mad” was ever used. “Annoying” is more prevalent. “A dud.” “Disappointing.” “Never going to get tenure.”
Ah, yes, that was it.
“They said I would never get tenure! Tenure!” he shouted into the gloom.