けっさく傑作kessaku
1.
A work that stands out for its exceptional quality and excellence in creative achievement, often recognized as a significant contribution in its field.
2.
An instance or creation that, while intended to be serious, is perceived as peculiar or absurdly amusing by others, often carrying a light-hearted irony.
3.
A remarkable or extraordinary occurrence that is both funny and entertaining, despite having occurred without any deliberate planning or design.
Example:
その偉大な画家の傑作が壁にさかさまにかかっているを見て、彼は驚いた。