At 15 followers, I will do the "Gaster Sings the Grinch Song" that I said I would do in my Q&A Results. For now, 15 followers is the next milestone, and I am very close. Currently at the time of making this, I have 11 followers, so just 4 more.
Side note: I was originally going to make this a video announcement, but I was nervous that I would hit 15 followers by the time I would finish, so I decided to do this instead, (although next time I plan on trying to be more creative).