There are many parallels between the story arcs in Star Wars and the Harry Potter books. For some time before the release of Harry Potter and the Half-Blood Prince, many people thought that there might eventually be a revelation along the following lines:

Voldemort: Dumbledore never told you what happened to your father.
Harry: He told me enough! He told me you killed him!
Voldemort: No. I am your father!

Alas, it never happened. Oh well. Probably because there was never a scene like this earlier on.

Transcript

Luke: No, my name's Adam. I'm not... Luke.
Obi-Wan: Oh, well, of course ye are!
Obi-Wan: Got something for ya. 'Fraid I might have sat on it at some point!
Obi-Wan: I imagine that it'll work fine just the same. Yer dad used it 'imself.
Obi-Wan: Severed limbs and all. Heh.
Luke: Thank you.
Obi-Wan: It's not every day that your young man turns nineteen, now, is it?
Luke: Excuse me, but who are you?
Obi-Wan: Obi-Wan Kenobi, Jedi Master and Member of the Jedi Council. Course ye'll know all about the Jedi.
Luke: Sorry, no.
Obi-Wan: No? Blimey, Luke, didn't you ever wonder how yer mum and dad learnt it all?
Luke: Learnt what?
Obi-Wan: How shall I put this...?
Obi-Wan: Yer a wizard, Luke!