We were covering "The Calls" (Owen) today (the Lit A class) and I mentioned the flippant quality of the last line which contributes to the irony in the poem -- the effect is created through the trivial presentation of what is essentially serious and grave, bringing across a sense of tragedy.
One thing about the modern century is that it was truly
tragic in that whatever that was essentially significant and profound (experienced by the subject, by the nation, etc.) was often reduced to silence by banality, or lost due to the subject's inability to communicate or express the depth of it; the greatness of the experience might even be such that the only response to that is to laugh or make it seem frivolous.
When you read
Heart of Darkness, this is seen when Marlowe realises profound truth and the only expression of that immense terror and understanding comes in the form the words uttered by Kurtz, "the horror, the horror!", and when he, upon facing the deceased's intended, finds himself unable to express the horrible truth that he has brought back with him and he lies, perpetuating the glory of the system that he has come to despise.
The smartass ironic stance that we know being adopted today isn't necessarily the irony of the early 20th century writers, depending on their intention or their subject of commentary. The irony of the early 20th C writers was a sort of serious irony that brought out the weight of the evils of its time through its apparent lightness; these writers were ironic "not because (they) did not care but because (they) cared too much." (You can check out this article on the web commenting on the irony found in pop culture today
here. The second page is pretty good.)
To end on a more frivolous note, another lit teacher and I had a discussion recently and we came to the consensus that Alanis Morissette's
Ironic didn't feature scenarios that were really ironic, they were just...
suay.