Gary Oldman, who played Harry Potter's godfather 'Sirius Black' in the world-famous 'Harry Potter' series, starred in 'Harry Potter and the Prisoner of Azkaban' directed by Alfonso Cuarón.

Gary Oldman, who went on to star in 'Harry Potter and the Goblet of Fire' and 'Harry Potter and the Order of the Phoenix', saw his presence in the series come to an end when the character he played tragically died during a battle in the Ministry of Magic.

Although 65-year-old Garry Oldman had many challenging scenes during his tenure as 'Sirius', the most difficult one for him was in the first 'Harry Potter' movie.

As a guest on the podcast 'Happy Sad Confused' hosted by Josh Horowitz, Gary Oldman revealed that the most difficult scene he shot as Sirius Black was the scene in 'Harry Potter and the Prisoner of Azkaban' where his character lies face down on the edge of a frozen lake while the Dementors suck his soul.

Speaking on the subject, Garry Oldman said that the main reason why the scene was so challenging was the physical discomfort of lying still in the cold for so long.

"IT WAS THE HARDEST THING I'VE EVER HAD TO DO"

Stating that the shooting lasted for a week, Gary Oldman said, "In one of the Harry Potters, there was a frozen lake. I was sort of dead and my soul was leaving my body and I had to just lie there for a week. Every day, doing nothing. Yes, the hardest thing I had to do was to lie next to a frozen lake."

"MY WORK THERE WAS MEDIOCRE"

Stating that he portrayed the character of 'Sirius Black' in a mediocre way, Garry Oldman said, "I think my work there was mediocre. I honestly think that maybe if I had read the books like Alan (Rickman), if I had known what was coming, I think I would have played it differently."