Also a Real Life Heartwarming Moment: Hergé had used a friend he made while researching for The Blue Lotus, Zhang Chongren, as the basis for Chang Chong-Chen, a friend Tintin makes when he is in China. By the time Hergé wrote Tintin in Tibet, he had not seen Zhang for several decades, but the French media managed to find him and arranged a trip for him to travel to France, where the two friends finally met. There is a photo of the two of them sitting in front of a cutout of Tintin and Chang saying the words used in their reunion in that comic.
Tintin/Hergé: I Knew I'd find you in the end!... This is wonderful!"
Chang/Zhang: "Tintin! Oh, how often I've thought of you!"