Marty jumped up from his bed and ran to his bedroom window and looked outside. The train had disappeared from the front lawn. Marty went downstairs to find Doc and his family still in their cots.
Marty went over to Doc and shook him awake, "Doc! Doc! Wake up!"
Doc sat up in his cot and said, "They're coming for me!"
"Doc! Your train is gone!" Marty said.
Doc got out of bed ran to the door. "Great Scott! It is! Marty, where did it go?"
Marty answered, "Back to the future, Doc. Or maybe the past."
"Then we have to go see where it went and get it back."
"Good idea, Doc, except if it went to the past or future, we have to go to the past or future and we have no way to do it!"
"Not unless we have that flux thingee," Doc said.
"The flux capacitor. You invented it!"
"Oh, yeah. I've had a memory problem for about a week."
"That's what Clara said."
"I think I got hit on the head with a rock."
"That's what Clara said."
"Speaking of Clara," Doc said. He walked over to Clara and saw she was sleeping. "Oh, she's sleeping. Nevermind."
"Doc, your train?"
"Oh yeah. We have to make a new one of those flux capacitor things. The one that you said that I invented."
"And how are you going to do that?" Marty asked.
"I have no idea, Marty. Maybe you can help me. You seem to remember how things were many years ago so you can help me make another one."
"Sure, Doc. Whatever you need, I will help you with."
The rest of the night, Doc and Marty tried re-inventing the flux capacitor but they didn't have very much luck. Finally, Marty had an idea.
"So, you say that you lost your memory when you were hit on the head with a rock?" Marty asked.
"Yeah, I think so," Doc answered. "But, of course, I can't remember much right now."
"Well, here's my idea. Maybe, just maybe, if you were hit on the head again with a rock, your memory may come back. I see it all the time in the movies."
"Marty!" Doc yelled.
"What, Doc?"
"That's brilliant!" Doc went outside and looked for a rock.
"I just have one concern. If I hit you on the head with a rock, are you going to forget me?"
Doc dropped the rock he was holding and it landed on his foot. "OUCH!" he screamed. After a few minutes of jumping around and rubbing his foot, he said, "Yeah, good thinking. I don't know what is going to happen if you hit me on the head with the rock, we will just have to experiment. Here."
Doc handed Marty a good size rock and bent over. "Here goes." Marty threw the rock at Doc. Doc landed on the ground with his face in the dirt. "Doc! Doc! Are you ok?"
Doc stood up and said, "Never better. Thank you, um, who are you?"
"It's me, Marty!" Marty said.
Doc scratched his head. "Oh. What am I doing here?"
Marty sighed. "You are here because you lost your memory and your train was stolen."
"It was?"
"Yeah. Is your memory back?"
"I don't know. Ask me a question."
"What is that 'Y' shaped thing in your train?"
"Why that's the flux capacitor. I invented that when I was hanging a clock and I was standing on the toilet and the porcelain was wet and I slipped and hit my head on the sink and there was the picture in my head. It was like a vision!"
"Doc! You're back!" Marty said throwing his arms around him.
"Yeah. I'm back, but who are you?"