Kiefer Sutherland lost his "dignity" in jail.
The 24 actor - who spent 48 days in prison in December 2007 after pleading no contest following his fourth arrest for driving under the influence (DUI) - admits he has done "stupid" stuff in the past, but admires the way late country singer Johnny Cash was able to write about life behind bars.
And Kiefer - who has penned a country solo album, Down in a Hole with friend Jude Cole - has tried to pay "homage" to the Ring of Fire hitmaker with his own music.
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He said: "Johnny Cash wrote about men in prison and he managed to do that with a kind of dignity that I always thought was incredible.