To assist, the definition of irony is: the use of words to express something other than and especially the opposite of the literal meaning. Or (1) : incongruity between the actual result of a sequence of events and the normal or expected result (2) : an event or result marked by such incongruity.
So an old man dying after winning the lottery is sad, but not an example of irony. I was quite happy to (very, very late) discover this video by CollegeHumor.com called Actually Ironic.
For you grammar lovers out there - the folks whose skin crawls when a comma splice comes after an improper use of the word 'their' - this song is for you.
Love and Lyte,