The 1976 talkback call that triggered ABC Rural to hit the ‘dump button’ for the first time

In 1976, Allan Humphries had recently moved from Darwin back to Sydney and was hosting the New South Wales Country Hour program, and when the ABC decided on a talkback gardening program, he was paired with ABC gardening legend Allan Seale.
 
It was a question on bonsai that caused Humphries to dump the caller.