Spike Lee, John Legend, P. Diddy and everybody else in the house were on their feet Saturday for Blake Griffin's out-of-this-world performance during the NBA All Star Weekend Slam Dunk contest.  You can watch the video here on RadarOnline.com.

The Los Angeles Clippers star brought down the house on shot after shot -- even fellow players like Kobe Bryant and Kevin Garnett were in amazement.  But his "Kids, don't try this at home" trick was a slam dunk OVER a car!

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Griffin easily won the contest -- and the car.  And video on his performance is going viral world-wide.

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