When you just have to be sarcastic. It doesn't even need to mean you are sarcastic all the time.
A nice reaction to insults, though.
"Hey! You dyed your
hair! it's black now!"
"Really, Linn. i never would have figured that out."
"Nice compulsive sarcasm, Savvy."
"God, you are so ugly. you should lose weight."
"You are so excellent at giving
"Why don't you just shut up, Kaila?"
"Because that would deprive all of you the sound of my lovely voice."