e.g.- a person reports to her friend that rather than going to a medical doctor to treat her ovarian cancer, she has decided to see a spiritual healer instead. In response her friend says sarcastically, "Great idea! I hear they do fine work!" (Note that this could easily be spoken literally by a person who believes in spiritual healing as a legitimate treatment for cancer.) The friend could have also replied with any number of ironic expressions that should not be labeled as sarcasm exactly, but still have many shared elements with sarcasm.