There's also a blurry line between sarcasm and lies. I'll often say things that are patently untrue to people with the expectation that they know the truth (and me) well enough to get that I'm not serious.
For instance, to my sister:
"I hate you." - sarcasm.
"I've already told you many times that I hate you." - obvious lie, maybe sarcasm?
For instance, to my sister:
"I hate you." - sarcasm. "I've already told you many times that I hate you." - obvious lie, maybe sarcasm?