The lowest grossing film of all times earned a measly $30 at the box office. This dubious honor belongs to the movie Zyzzx Road:

That’s not a typo. I didn’t mean 30 million dollars. Or 300,000 dollars. Zyzzyx Road, released on February 25th of 2006, was released in one theater, where it played for six days and earned 30 dollars total. That would be an average of five dollars per day, although Box Office Mojo tells us that the film actually made the bulk of its money – twenty bucks – on the opening weekend.