So it proved. He then made the point that Stephen Fleming, New Zealand's longest serving and most successful captain ''was a shocking tosser as well".
Fleming went at a 46.25 percent success rate over his 80 tests in charge.
Of New Zealand skippers who did the job for a reasonable length of time going back to the late 1960s, four men, Graham Dowling, Geoff Howarth, John Wright and Ken Rutherford won more than half their tosses.
Some had dreadful records, such as Bevan Congdon and Glenn Turner.
Internationally speaking?
Mathews is developing a cracking record, having won 11 of 15 tosses. Others are adjacent to the 50 percent mark.
What about the mighty Don Bradman? A test batting average of 99.94 didn't equate to a fabulous coin-toss record. He won just 10 of his 24 tests as Australian skipper.
McCullum's ODI record by the way? Sixteen wins from 34 tosses.
New Zealand captains:
Ken Rutherford (18 tests, 12 tosses won, winning percentage 66.6); John Wright (14, 8, 57.14); Geoff Howarth (30, 17, 56.6); Graham Dowling (19, 10, 52.6); Martin Crowe (16, 8, 50) Jeff Crowe (6, 3, 50); Stephen Fleming (80, 37, 46.25); Brendon McCullum (22, 9, 40.9); Mark Burgess (10, 4, 40); Bevan Congdon (17, 4, 23.5); Glenn Turner (10, 2, 20)
International captains:
Angelo Mathews (Sri Lanka) (15, 11, 73.3); Michael Clarke (Australia) (40, 22, 55); Misbah-ul-Haq (Pakistan) (34, 16, 47.0); Alastair Cook (England) (28, 12, 42.8); MS Dhoni (India) (60, 26, 43.3)