 The alternate identity of Oogie Boogie where its not a bunch of bugs but   Dr. Finklestein (the mad scientist), he said he became Oogie Boogie because   Sally was in love with Jack even though he created her and as Oogie Boogie   hed give her a lesson shes never forget, Finklestein then mentions a   creation that will like him and with Igors help he escapes through a trap   door, this segment ends with Jack saying "i cant believe this".