Irony that is about an un-expected events.

Irony where the writers used to increase anticipation to the reader

The Gift of the Magi, a wife cuts off her long hair to sell it in order to buy her husband a chain for his prized watch. Meanwhile, the husband has sold his watch in order to buy his wife a comb for her hair.

Think of the knight in Monty Python and the Holy Grail: with both his arms sliced off, he says, nonchalantly: “It’s just a flesh wound.”

Saying “Oh, fantastic!” when the situation is actually very poor

if someone got in a fender bender and said, "Guess today's my lucky day…"

A policeman got robbed

A woman thinks her boyfriend is acting strangely because he's about to propose, but the audience knows that he is planning to run away with another woman, intensifying emotions.

Fire station fire down.