premise: Diorama is the fourth studio album by Australian alternative rock band Silverchair. Released on 31 March 2002 by Atlantic/. It won the 2002 ARIA Music Award for Best Group and Best Rock Album. The album was co-produced by Daniel Johns and David Bottrill. While Bottrill had worked on albums for a variety of other bands, "Diorama" marked the first production credit for lead singer Johns.
hypothesis: Daniel Johns and David Bottrill have spoken to each other
reason: Daniel Johns and David Bottrill co-produced the album, it follows that they have at least exchanged words once.