The Raven (1963)
Peter Lorre has a problem. An evil wizard, played by Boris Karloff, has turned him into a sleek, blackbird. Oh, he's still Peter Lorre, but, darn it! Vincent Price, of whom he was counting on having the correct magical formula to change him back into a man, just can't seem to get it right. Oh, his daddy seems to have all the correct magical ingredients hidden in his ancient laboratory, but, something goes wrong, and he just doesn't mix up a big enough batch! Thus, poor Lorre, whose life is tough enough for being a put-upon little fat man, is left walking around with two big black wings, occasionally dropping off feathers and lamenting his sorry luck.