This may make for an interesting topic, there's alot of game id's out there, share your stories!
I remember when I was real young, 3 or 4 would be my guess...We (father, mother and I) visited my grandparents. One afternoon while my parents were out, I was left alone with my grandfather and grandmother. I was bored, so I went looking for them, as they had stepped out of the room for a few minutes. I heard voices and followed them until I was at the doorway to their bedroom (not a nasty story, I promise). They were arguing about something, and my grandmother was really giving it to my grandfather, calling him every bad name in the book. He just shrugged it off. She then called him "Buster", and that really set him off. Any swear word and bad name you could think of he didn't mind, but as soon as she called him "Buster" he got really upset. I then left their room and went back in the living room. Since then the name has stuck with me.