As already known this dad and son jodi is more like friends, for Abhishek and Amitabh Bachchan love to goof around even while the two are shooting.

Recently the two happened to be filming on adjacent sets, Amtiabh was filming for Vivek Sharma's Bhootnath, while Abhishek was filming for an ad.
During their respective breaks both of them would walk over to the other's set to talk and joke. On one such occasion, when Amitabh was over at Abhishek's set and Vivek had to send an assistant to summon Amitabh back. The assistant walked to Abhishek's sets without realizing the cameras were rolling, forcing a retake.

Abhishek jokingly swore revenge promising to ruin a shot on the sets of 'Bhootnath' just as the assistant had ruined his shot. Living up to his promise Abhi strode on to the sets of 'Bhootnath' wearing Amitabh's costumes, grabbed a script and started to recite Amitabh's dialogs asking the cameras to roll.
While the crew broke into fits of laughter, Amitabh added:
Oh, You have got a new actor in my place, I should take your leave now.
It seems, not only the father-son but also the respective crew members of the stars were friendly enough to let them goof around!
Via: Sawf