Hello Chieftain!

Quite interesting. Where did this interview appear? Isn't Mark Hamill's story that Prowse's line on the set was something about Obi-Wan killing his father? Which is likely to be true with the lightsaber battle on Mustafar in Episode 3...but of course from a particular point of view. ;)
 

The scan is of a page from a magazine called Little Shop Of Horrors and appeared in 1978. A poster in alt.fan.starwars remembered having read it and asked if anyone else had seen it. After the requisite accusations-of-trolling, he dug out the magazine and scanned the page.