A/N: Adam is my name for the Doctor's clone.

"You're afraid of heights and falling?" Rose asked as they stood in front of the zeppelin that was going to take them home.

"Yep," Adam said, nodded his head.

"When did that happen?" she asked.

"I'm not really sure, but, due to genetic memory, I'm afraid of both heights and falling."

"But the Doctor was never afraid of either one."

"I don't think it was him."

"Was it Donna? Was she afraid of either of those?"

"Nope, it wasn't Donna."

"Then where did it come from?" Rose asked and Adam smiled, wiggling the fingers of his right hand.