Kaneda running up out of nowhere and punching Tetsuo HARD in the face during their fight at the stadium, before continuing to beat him into submission. See Deface of the Moon.
Kaneda's very first fight with Tetsuo. After the latter literally ran through an army, Kaneda fought him and nearly won.
Seeing Possessed!Kei take on Tetsuo was pretty awesome, even if it only lasted for a few seconds.
When the army has been obliterated, when the ace-in-the-hole SOL satellite has been knocked out of orbit, and when Tetsuo's powers are reaching godlike proportions, does Colonel Shikishima give up? No, instead he goes to Tetsuo to try to convince him to surrender, and when that fails shoots him with a pistol. It fails, but the sheer audacity of trying that on Tetsuo when the Colonel knows exactly what he is capable of is just astounding.