"I received a phone call from my agent, who asked me for my measurement details. Having told her, I was then asked if I would be free to replace fellow actor Peter Dukes on something called Star Wars, as Peter had phoned in sick."
The infamous scene was shot on the second day of filming when Goode was suffering from an "upset stomach".
"By midmorning I had paid three to four visits to the loo/bathroom," Goode said.
"Having re-dressed myself and returned to the set, I felt the need to rush back to the gents' toilets, but I was placed in [the] shot. On about the fourth take, as I shuffled along, I felt my stomach rumbling, and 'bang,' I hit my head!
"As I wasn't moving too fast, it was more of a scuffed bash, so it didn't hurt, but as no one shouted 'cut,' I thought the shot wasn't wide enough for me to be in frame."
The actor, who was 31 years old when he filmed Star Wars, assumed that the head bang would be edited out of the movie before it reached cinemas.
"But when I did see it in the cinema, I thought: 'OMG, that's me!'" Goode said.