Actor Suriya has revealed that one of the most talked-about sequences in Karuppu was filmed nearly six months after the team had wrapped production, after director RJ Balaji decided to rework the climax.

Speaking to Hollywood Reporter India about the last-minute decision, Suriya said he had already moved on to another project when RJ Balaji called him back. "Because there wasn't enough time, I had already transformed into my Vishwanath and Sons look—clean-shaven and everything. Suddenly, he said, 'No, no, no... I'm not happy with the climax. I have an idea. Can we do this?'"

The actor admitted he was initially taken aback as the film had already been completed. "I was wondering, 'How? When?' After six months, after pack-up, the shoot was over, the edit was locked; this new idea suddenly came up. So we travelled from Hyderabad to Chennai in two days."

Suriya also shared that he sought divine guidance before filming the emotionally demanding sequence. "Right behind the camera, there was a statue of Karuppaswamy. It had been part of a song sequence and was just a prop. I simply prayed to the statue and asked, 'Please guide me. Come into me and guide me.'"

Explaining how he approached the role, Suriya said he drew inspiration from real-life videos of devotees believed to be possessed by the deity during temple festivals. "Across South India, and even in North India, where we call it Kuldevam or Kuldevta, people believe in ancestral gods. I've watched many YouTube videos where people surrender themselves during festivals. They believe God has entered them."

He added that the physicality of those devotees helped him shape the performance. "In that trance, they speak prophecies. They believe the deity has possessed them and is speaking through them. Those videos became my small source of inspiration. I incorporated those emotions and movements into the performance."

Suriya also reflected on the transformation the role demanded of him. "There are certain faces that can unintentionally look funny when they open their eyes, and I was worried about losing the sincerity of the performance. But fortunately, it worked out."

The Karuppaswamy climax sequence has since become one of the most celebrated portions of Karuppu, with audiences particularly praising Suriya's intense transformation and performance.