The Walk the Line star fooled fans and critics in 2008 when he 'quit' Hollywood to launch a rap career, later admitting the stunt was an elaborate prank with his brother-in-law, fellow actor Casey Affleck.
But the Oscar-nominated star was so convincing in his new 'role' that A-list movie offers dried up following the highly-publicised project.
He tells British magazine Live, "There was definitely a period after I'm Still Here when there was a discernible difference in the quality of movies I was being offered...
"There was a moment in which, frankly, I was placed in a very dangerous place with my mortgage. I didn't know what to do. I was nervous because I didn't know what was going to happen. My accountant was very nervous."