Q: The person who makes it doesn't say what it is.
The person who receives it doesn't know what it is.
The person who knows what it is doesn't want it.
What am I?
A: A baby.
So, a daughter asks her father, "Dad, what is your opinion on abortions?" Her father says, "Why don't you ask your sister?" The daughter responds, "But I don't have a sister... Oh."