Detective Comics #275 by Sheldon Moldoff. "The Zebra Batman"! Robin's right. Zebras are a menace. Just ask grass. I'm dying to know how Zebra Batman bends lightpoles and lifts cars. Awesomeness.
Update: A "plot" synopsis - Batman and Robin encounter a magnetically-powered villain, the Zebra-Man. But a charge from the machine which gave Zebra-Man his powers turns Batman into a “Zebra-Batman” who repels all solid matter, and cannot regulate his powers.