Bank Mynas and water buffaloes hit it off just great. The buffaloes have plenty of treats walking around on them for Mynas to actually be territorial on the buffaloes' back.
But the real battles are fought at the ears, for the ears, and going by how the buffaloes endure the vociferous battles taking place at their ear, it must be good for the ears.
(Photograph details: Mynas on buffaloes - shot at Basai wetland in Haryana on 6 Sep 2008; the vocal battle for the ear - shot at Etawah on 12 Feb 2009.)