Disclaimer: I don't own anything in this story except the story itself. Not even the rabbit, who comes from Shore Leave.

One fine morning, Chekov was late reporting to duty on the bridge. (A/N- don't ask me why it was a fine morning, it just was, mainly because the sun is shining out here in Utah and making me feel happy, and for some reason it being a fine day somewhere on earth in the year 2003 made it be a fine day somewhere in space in the future, who-knows-what year.) Anyhow, he was late. He took his seat at his console, put his hand on the controls, and did his best to look like he was doing something important.
"Mr. Chekov," Kirk said. "You are late."
"Wery, wery sorry, sair." Chekov said, sounding somewhat distracted.
"Would you like to tell me exactly WHY you were so late?"
"I vos blocked."
"Blocked?"
"In ze (A/N- does Chekov say 'ze'?) hallz. I vos blocked in ze hallz."
"By what, may I ask?"
"A rabbeet."
"Oh."
"A wery, wery lairge rabbeet."
"I see."
The bridge returned to normal, and life went on. (A/N- I take that back, life didn't go on.)
Half an hour later, Kirk turned again to Chekov. "A rabbit, did you say?"
"Yis, sair, a rabbeet."
"And what was a rabbit doing on my ship?"
"I don't know, sair. I didn't aisk."
Kirk paused a moment, then flipped a switch on his console. "Bridge to security."
"Security here, captain."
"Keep an eye out for a rabbit."
"A rabbit, did you say, sir?"
"A very large rabbit."
"Oh. alright, captain."
"Kirk out."

The next day was not such a fine one. It was raining. No, not out in space, but on a planet relatively near to the Enterprise. So it was raining.
Chekov was late again.
He rushed in, took his seat, and tried to look important.
"Chekov, you're late."
"I know, sair."
"Why?"
"The rabbeet. But zis time I asked heem vat he vas doing on your sheep, Kyuptin."
"And what did the rabbit say?"
"Eet said eet vas late. Late for a wery important date."
"Mr. Chekov," Kirk said, leaning towards the Russian. "No one but you has seen this rabbit.
"Oh."
"So. why are you really late?"
"I told you, sair, becuz of a rabbeet!"
Kirk paused a moment, then asked, "Chekov, when was the last time you had your. ah. mental health checked?"
"I don't know, Kyuptin, but I-"
"No excuses, Mister. Get down to sickbay."
"But-"
"Go!"
"Yes, sair." Chekov said, sounding miserable. He left the bridge and headed on down to sickbay. (A/N- I know it's down because the bridge is located on the top of the ship).