1. Playing Star Wars Jedi Knight: Dark Forces II against my friend over a modem. Since I always beat him so badly, I decided to cut him some slack by running around with no weapons. I ran into a room with no other entrance/exit, so I had no choice but to try to slip past him when he entered the room. As he opened the door, I ran towards him and punched him in the face and to my surprise, he slumped to the ground. The fool hadn't bothered to replenish his health/shields!
2. More multi-player, this time against my sister in Mario Kart: Double-Dash!! last Christmas. She was ahead of me, but I was catching up to her and had just received a Mushroom. I could see that her second character was holding a red shell and I knew that if I used the Mushroom to pass her, she would just hit me with the shell. So I used the Mushroom to ram into her kart from behind, which not only sent her off track, but also caused my character to steal her red shell. As soon as I realised what happened, I fired the red shell back in her face. She is determined to get me back for that.
3. Worms 2 online. One worm left, against an opponent who also had one worm left, but also had most of his heavy artillery still available (air strikes, napalm, etc.). One more go for him and he would surely win, so I had to make sure my turn counted. So I spent a long time checking the distance, the wind, the angle, and then fired my bazooka in his general direction - all the way on the other side of the map. Direct hit, game over!!