"Ultimate irony" refers to a situation where something happens in a way that is unexpectedly opposite or contradictory to what was expected, often leading to a humorous or dramatic effect. Full definition
And that is the ultimate irony of this story. (fortune.com)
«The ultimate irony of the investment business is that there is no question that an obstetrician can deliver babies better than the husband or wife. (richdad.com)
The ultimate irony is that the companies that did spend heavily on share repurchases when capital was super-abundant may not have enough firepower to purchase shares when another bear market ensues. (latest.13d.com)