The 63-year-old used to shoot from 9 a.m. to 6 p.m. everyday and still remained his jovial self.
"When the rest of the cast, out of concern, would ask Randhir Kapoor to rest, he would simply reply saying, 'When you work, you work'. This inspired the rest of the cast to sit on the sets and encourage each other, " said the source.
"Randhir Kapoor surprised everyone on the sets with his professionalism. He was very accommodating. And when it comes to his acting his comic timing is impeccable. He was truly an inspiration on the sets, " the source added.
"Housefull" is being produced by Eros International and Sajid Nadiadwala. It will release April 30.