The Woman In Black actor joked that he would be driven to "kill everyone" if he landed in any other profession.
"I would just be a nuisance in any other line of work," the Daily Star quotes him as saying. "I think if I was in an office, I might come in one day and kill everyone. I might be one of those guys who just goes crazy."
Radcliffe also dismissed suggestions that starring in Harry Potter had denied him a childhood, though he accepted that being around adult co-stars may have accelerated his alcohol issues.
"People always say stuff like: 'You didn't have a childhood'. That's an insulting thing to say to somebody," he said. "Being on a film set is a fantastic place for a 10-year-old boy.
"What Potter did was put me around people who were older than me. I'm very good fun for the first four drinks, then after that it's a rapid, rapid decline where I have to be helped home. Blackout was kind of my thing."
> Daniel Radcliffe: 'Harry Potter's Richard Harris inspired my drinking'
> Daniel Radcliffe: 'I almost quit Harry Potter'
Watch Daniel Radcliffe chat to Digital Spy about The Woman In Black below: