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Chris Brown was the victim, for a change, in an aggressive face-off with a heckler who got dangerously close to Chris' car, then yelled to CB ... "Is that motherfu**er bulletproof?!"

The scary incident went down outside L.A. nightclub "Playhouse" -- Chris was making a quick exit

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We can't quite put our finger on it ... but there was something strange about our encounter with "Blade Runner" Oscar Pistorius in Los Angeles back in October ... something ... creepy.

On the surface, he was totally polite with our camera guy as he left dinner at Mercato di Vetro with a friend ...

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Oscar Pistorius -- the Olympian now accused of murdering his model girlfriend -- was never violent toward her in the past -- this according to a source who worked closely with the victim in her modeling career.

The source tells TMZ ... she was with Reeva Steenkamp "a lot" during the

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Another day, another RAGING SHE-FIGHT involving one of the stars of "Love & Hip Hop" ... with hair-pulling, name-calling and a nasty panther-like, claw-first takedown ... and TMZ has the footage.

It all went down at a fancy party inside a nail salon in Manhattan ... when Erica