My best moments has to be:
Stunt Car Racer: me and a friend, using nullmodem-cable to hook up two A500. On one track, I was far ahead, and thought I should tease my friend. So, I started driving in reverse, at the same time he was driving as fast he could forward to catch me up. I made a backward jump, and at the same time he made a forward jump, and we collided in the air. We never managed that since =)
F-18 Interceptor: First time I saw this game (around 1989) runing on a friend's A500 , I was "doomed/hooked" I knew I just had to buy an Amiga. I later bought that game from that friend. I still have the game and the box. The intro-music used to give me the chill each time, as I knew the action was soon starting.
F16 Combat Pilot: We used nullmodem-cable. I tried to learn a friend to handle the air-craft. We did a dogfight, I said "only machinegun, no rockets". He said "ok" We was approaching eachother, suddenly the alarm went off in my plane, by a mistake he had fired off all his rockets against me from close range. No big surprise, he "got me" =)