"You know," Kirk said, "there's one thing about Nomad that I still don't understand." Kirk and Spock were in the mess hall, eating lunch together.
"And what would that be, Captain?" Spock asked.
"How Nomad thought I was Roykirk for so long. I could see making the mistake when first scanning, but it had plenty of access to our databases afterwards to figure out the truth."
"Oh, that's simple," Spock said. "I edited the database to reflect Nomad's assumptions."
"You..." the captain trailed off before raising an eyebrow and grinning. "You didn't!"
Spock shrugged. "Do you object? It was in the best interest of the crew, after all."
"I don't object, Mr. Spock. I merely question the... scruples of such an action."
"Deception is occasionally a logical choice," Spock replied. "In this case, it probably saved all of our lives."
"I guess I'll have to take your word for it."