Former President Joe Biden and his son Hunter paid a surprise visit Monday morning to the "Reacher" Season 4 set in Philadelphia.

Joe Biden accidentally crashed the set of Reacher on his way to breakfast Monday in Philadelphia, inadvertently strolling onto the premises as crew members filmed a police chase scene for the fourth season of the Prime Video thriller.

The blockbuster action star shared a series of images of the impromptu meet-and-greet along with a joke that they discussed "string theory and quantum entanglement."