Spoilers follow in the words and the videos. Don't watch if you're not finished with the most recent season.
David Tennant // The Doctor faces certain death by the Vashta Nerada in "Forest of the Dead" when he's left alone with one, defenseless. All he does is talk and it retreats.
Matt Smith // A tremendous scene in "A Good Man Goes to War." His angry and spiteful words to Colonel Manton, hereby known as Colonel Runaway, are chilling, and that I cheer. This is the point where Matt Smith finished filling the hole left by David Tennant, and that opinion was cemented with the line, "Good men don't need rules. Today is not the day to find out why I have so many."
Related posts //
The Doctor's Moments ~ Stunned
The Doctor's Moments ~ Powerless
The Doctor's Moments ~ Funny