Authors:

That's the difference between irony and sarcasm. Irony can be spontaneous, while sarcasm requires volition. You have to create sarcasm.

Christopher Moore (2009). “Lamb: A Novel”, p.149, Hachette UK
That's the difference between irony and sarcasm. Irony can be spontaneous, while sarcasm requires volition. You have to create sarcasm.