The Broken Ear
Professor Euclide is an absent-minded professor appearing in "The Broken Ear" who forgets his glasses, wears his cleaning-lady's overcoat, holds his cane upside down as if it were an umbrella, mistakes a parrot for a man, and leaves his briefcase next to a lamp post. In the original edition published in 1935, his name is given as Professor Euclide (after the Greek mathematician). He is one of Hergé's many prototypes for Professor Calculus.