Isn't it ironic ... don't you think

Do you know the right meaning of irony and sarcasm? Well I do, but my dear Canadian friends don't and so I had a good, lively and funny discussion this morning about irony and sarcasm. Canadians, think irony is sarcasm and not that sarcasm is only a sub-form of irony used to hurt people. So here the definition from dictionary.com

Irony:
The use of words to express something different from and often opposite to their literal meaning.

Sarcasm:
A cutting, often ironic remark intended to wound.

I have had this discussion with several Canadians and I actually learned just to skip this topic :-)