My cousin had bought an A500 with a 1084 monitor and the game Mercenary. I was totally sold on Amiga after that.
We played the game all night and after that he showed me Amegas.
6 months later I bought an secondhand A500, the seller thought that it was broken, it wasn´t. It was the floppydrive that was broken so I fixed it and had many fun hours with it and the rest is history. :-)