Today, I visited a cousin's island and randomly talked to K.K. even though it wasn't night yet. He casually mentions that there is another villager on the island who has a birthday month and was planning something to surprise them with and asked if I wanted to help. When I agreed, K.K. gave me a letter to write on (had a K.K. style to it) and that he would send it to that villager on their Birthday. I assumed this would go along with his other gifts like the song and such. I never seen this mentioned before. Did anyone else know about this or had this happen?