The phrase "certain irony" refers to a situation where something unexpected or contrary happens, often in a way that seems coincidental or contradictory. Full definition
@TGM — I think I get the point, I think the cartoon wasn't as good at pointing out certain ironies as some of his others are. (nakedpastor.com)
For all of its flaws, Lord of War is certainly ambitious, and occasionally taps into certain ironies that almost make it nearly work as a satire (the machine gun chiming like a cash register with every bullet fired is memorable), but never carries the momentum long before the tone changes into a lazy comedy, stagnant drama, or mild farce. (qwipster.net)