LUKE: You know, I think that R2 unit we bought might have been stolen.
OWEN: What makes you think that?
LUKE: Well, I stumbled across a recording while I was cleaning him. He says he belongs to someone called Obi-Wan Kenobi.
Owen is greatly alarmed at the mention of his name, but
manages to control himself.
LUKE: I thought he might have meant old Ben. Do you know what he's talking about? Well, I wonder if he's related to Ben.
Owen breaks loose with a fit of uncontrolled anger.
OWEN: That old man's just a crazy old wizard. Tomorrow I want you to take that R2 unit into Anchorhead and have its memory flushed. That'll be the end of it. It belongs to us now.
I can see C3P0 getting his memory flushed before this scene but I don't think R2 ever did.
Diaz tells us that tonight on E! News Live, George Lucas reveals a secret about C-3PO and R2-D2 from Episode 3!
Patrick Stinson: Anakin in Episode One created C3PO. In the original trilogy, C3PO doesn't recognize him as Darth Vader because...
George Lucas: Well, one, his brains have, his memory system has been erased and so has R2's. So, they don't remember anything from the first trilogy. I'm telling you something from Episode 3, but I shouldn't be telling you that, but I think most of the fans already know that.
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and will everyone give it a rest now??? He told it himself!
You have to check out this shot of a young 3P0...