Irony

I believe I used this as a word of the post before, but this is too good an example to pass up...

Word of the post:

i·ro·ny
n. pl. i·ro·nies

The use of words to express something different from and often opposite to their literal meaning.
An expression or utterance marked by a deliberate contrast between apparent and intended meaning.
A literary style employing such contrasts for humorous or rhetorical effect.
Incongruity between what might be expected and what actually occurs: "Hyde noted the irony of Ireland's copying the nation she most hated" (Richard Kain).
An occurrence, result, or circumstance notable for such incongruity.
Dramatic irony.
Socratic irony.

Example: See here.