I saw this on a few other sites and there is probably one on here. So lets get this thing on the road, shall we?
So all you have to is give the wrong answer to the question. The name pretty much gives it away but oh well.
Here is an example:
Q: Who is Albus Severus Potter??
A: Ron and Hermione's Son only Harry and Ginny adopted him.

That was a weak one but whatevs...Lets start.

Who is Harry Potter??