Talk about shocking the system — two of Detroit’s biggest legends collided when Eminem crashed Jack White’s stage during the NFL’s Thanksgiving Halftime Show at the Lions’ annual Turkey Day Classic.

Jack was the only one officially on the bill — tearing into “Seven Nation Army,” the forever stadium anthem at Ford Field — before he shocked the crowd by bringing out fellow Detroit legend Eminem for a surprise cameo.

Eminem hit the stage in full Detroit armor — hoodie up and rocking a custom Lions jacket — and launched into a wild mashup of “Till I Collapse” with the White Stripes’ “Hello Operator.”

And yeah, solid hire … ’cause Em knew EXACTLY how to light that place up. Ford Field went feral the second he hit the stage!