When it was published in 1938, Action Comics #1 cost 10 cents. It was the first appearance of Superman. As a result, surviving copies can sell for more than a million dollars.
Joe Shuster drew the now famous cover image. It shows Superman heroically lifting a wrecked car. Or we assume that he's being a hero. Have you actually read Action Comics #1? I haven't.
Fortunatelly, artist Kerry Callen has a scanned an interior page to reveal what Superman is actually doing.
-via Jalopnik
P.S. Thanks to Callen's encyclopedic knowledge of comic book history, we also know that Batman is a hoarder.