May 8, 2015 10:05 AM EDT

Mad Men creator Matthew Weiner’s spoiler-phobe tendencies wouldn’t make him a likely candidate to reveal info about the show’s finale on a talk show. However, he was so grateful for Conan O’Brien’s support over the years that he brought a clip along. Apparently, Mad Men does end with someone—or rather something falling out of a window. It may not please all fans, but Gallagher might be happy.

In all seriousness however, watch to discover what Weiner thinks about the theory that Don is D.B. Cooper. “I think all police sketches without mustaches of white guys look like Jon Hamm,” he said.

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