This was a genuine hand bid at Witney Bridge Club. The bidding sequence was 1♦ - (2♦) - 3♦ - (4♦) - 5♦. Here is the explanation according to the participants:

1♦ was natural. 2♦ was a Michael's Cue bid, showing both majors at least 5-5. 3♦ was natural. 4♦ was "I have no preference, you choose", and 5♦ was natural, and a good sacrifice.