I found out about Animal Crossing in 2006 when I first got a DS Lite and "New Super Mario Bros". There was an advert for ACWW in the pamphlet, and it looked really fun so I got ACWW and I became completely addicted.
Then through the wonders of internet I found out about ACGC so I got that as well (and it became my favourite one), and then got ACCF when that came out.
Now I'll be getting ACNL when it's finally released and it's all thanks to "New Super Mario Bros".