Every day I talked to her, I got a little closer to Sable. When you first enter the Able Sisters tailor shop. Mabel does all the clerking while sable just grunts at you. She's busy, she doesn't mingle with the customers. Gradually, you can get her to open up... and she tells you about the difficult time the Able girls had growing up.
It's an unexpectedly sad story. Sable shares some maudlin memories and winds up treating you quite a bit nicer since you're such a good listener.
I only made three custom patterns, so I'm reasonably sure this is attached simply to your efforts to communicate with Sable.
The Able Sisters' backstory was in the GameCube Animal Crossing... but I think the psychoanalysis of Blathers is new to Wild World.
I'm not sure what triggered it, but I walked in on Blathers in a reflective mood one morning. Normally, the dude is asleep when you enter the Museum in daylight hours... but this time he was clearly down in the dumps. I talked to him and received a strange conversation about why he hates insects so much. The exchange ends with him more or less upbeat about his phobia, so I don't think it will play out as long or as thoroughly as the Sable chat.
And then there's this little darling: Katie. She's been in my town for two days now, just standing in a tree grove crying. She wants to be back to her mommy in Anima, the town I entered last Thursday to visit Grant. When I talked to her, she followed me around for a bit, in anticipation of me heading out the gate to go to Anima. Unfortunately, Grant didn't have his town open when I tried, so Katie is still lost with me in Adamsvil. Grant, I hope I run into you again - and I hope Katie sticks around until I do - because I want to see what amazing thing happens when I reunite her with her mother.