Ferr getting a higher score than anyone else on his 3rd song during the Karaoke Revolution Party LP.
Maxwell wins a Quicktime Event battle with Krauser in Resident Evil 4...without looking at the screen. He just shakes the Wiimote and presses the buttons constantly while leaving to get a glass of water, and he beats the cutscene flawlessly.
Defeating the final boss on Prototype at the very last second.
Maxwell's flawless defeat of the Iron Knuckle in the Fire Temple in Ocarina of Time: Master Quest should count as well.
Maxwell shows off his ability to play scene-appropriate songs yet again in his playthrough of Majora's Mask, when he plays a song from Brain Powerd to accompany the scene where Anju and Kafei reunite at the end of the final day. The song synchronizes perfectly, right up to the triumphant swelling of music as Kafei finally comes through the door at the last second. Of course, he spoils the mood immediately afterwards by letting the moon crash into the earth, but hey— it was awesome while it lasted.See for yourself.