Violent J -- one half of the rap group Insane Clown Posse -- says he left his car unattended for a grand total of ten minutes yesterday ... and when he came back, his car stereo was GONE.
Sources close to Violent J -- real name Joseph Bruce -- tell us, the rapper and his pal were making a quick pit stop at some store in Detroit when the robber struck.
But according to sources, J blames himself -- because he left the door to his 2010 Suburban unlocked. Probably not wise.
We're told J doesn't plan to file a police report -- he's gonna suck it up and buy a replacement.
Detroit, ladies and gentlemen.
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