Could he be referring to this?
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Since leaving the series that made him a household name, Daniel Radcliffe has chosen roles deliberately and with an eye for variety. For his next role, however, he's set to return to the fantasy genre. But "Horns" is no "Harry Potter."
The film is an adaptation of a book by Joe Hill (a best-selling author whose dad you may have heard of, Stephen King) and Radcliffe will play the peculiarly named main character Ig Perrish. In "Horns," Ig is the primary suspect in the investigation of his girlfriend's brutal rape and murder. The fantasy aspect comes into play when Ig wakes up from a night of drinking only to find a set of horns growing out of his head.