A massive set built in Ooty for a month-long schedule was severely damaged by rain on only the seventh day of shooting. Consequently, the crew had to relocate and finish those portions on sets in Mumbai.
The iconic rain dance in the song was almost a catastrophe. Katrina, who had a phobia of cold water, had to stand under a freezing rain machine for six hours. Ranbir, to warm her up, started telling her the worst jokes he knew. One joke – about a chicken crossing the road – made Katrina laugh so genuinely that Santoshi kept the camera rolling. That unscripted laugh is the one you see in the final cut.