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The goal that made Shunsuke Nakamura famous during the 2006-07 UEFA Champions League season was his stunning free-kick against Manchester United. This goal helped Celtic win 1-0 on November 21, 2006, and ensured Celtic's progression to the knockout stage of the competition for the first time in their history.

Here's an image of Nakamura celebrating that memorable goal:

For more details, you can read about it on the UEFA website and the Celtic FC official site.