Rare Jack Nicholson sighting at Staples Center on Tuesday -- where the Hollywood legend returned to his old stomping grounds to watch the Lakers crush the Knicks.
... and during the game, he became BFFs with rap star Tory Lanez!
Remember, 82-year-old Jack used to be a regular at Lakers games -- and was even considered the Lake Show's #1 fan!
But, a few years ago, when the Lakers were in the thick of sucking ass ... Jack basically stopped going to games and even offered to sell his floor seats to TMZ (we couldn't afford 'em).