Metallica's manager doesn't see Justin Bieber as having a lasting  career. 

Peter Mensch, who also manages the Red Hot Chili Peppers, tells the  UK's Sun he believes the pop superstar's career "is over in three  years."  He bases his prediction the 19-year-old singer's behavior, which  has included an alleged spitting incident with a neighbor, a noise dispute in  Los Angeles, and an attempt to bring his pet monkey into Germany without the  proper documentation. 

Mensch says he doesn't know "what Bieber's problem is," and says the  singer's own manager "is scared."  But Mensch thinks a dose of old  fashioned discipline would put Justin on the right path, saying he'd "take  Bieber to the woodshed and spank him."

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