Jailed rapper Shyne is picking a fight with 50 Cent from prison after calling the In Da Club hitmaker "a joke."
Shyne, real name Jamal Barrow, has released For The Record, a hard-hitting track that mocks 50 Cent with lyrics which threaten to reunite 50 Cent with his dead mother.
The track - which features Shyne rapping down a phone line - also alleges that 50 once tried to sign the Bad Boy Records star to his G-Unit label.
Speaking exclusively to MTV News from prison, Shyne says: "He's (50 Cent) a kid to me. He's like a little dude. In here we call them my little homies."
It is believed Shyne's new track is his attempt to hit back at 50 for comments he made on a mix track last year.
On that track, 50 rapped: "I heard Irv (Gotti, boss of The Inc) trying to sign Shyne, so I don't got no love for him. Tell him 50 said he's soft. He won't shoot up the club again."
Shyne adds: "I was just falling back, then I got word he said something he wasn't supposed to say. It's one thing if he would have said it and stood by it.
"But he said it and, at the same time, he was trying to sign me to G-Unit Records."
Shyne has been imprisoned for the past three years after he was found guilty of attempted murder in the nightclub shooting incident that had his former label boss P Diddy and Jennifer Lopez running from the scene.