F: "Rennie, are you an organ donor?"
Me: "Well, not yet." (pause) "I'm still using mine."
F: "I saw a billboard, and it says you're not an organ donor unless you've told your family."
Me: "Hey sis, donate my organs when I die, will ya?"
Sis: "Don't worry, I'm already planning on it." (pause) "I already have contacts lined up I'll be selling them to."
Me: "No no, I said donate my organs, don't sell them!"
Sis: "Do I have to wait until you die?"
F: "You don't really need both kidneys, do you?"