Chekov had a splitting earache ever since he woke up.

The captain noticed him tilting his ear to one side every now and often and he nearly punched in the wrong co-ordinates. So via captain's orders Chekov had to get checked out by Doctor McCoy

Chekov walked into doctor McCoy's office where, much to his surprise the doctor asks him, "Would you please help me with a problem I'm having?"

'Sure, doctor, Vhat can I do for you', says Chekov

"Would you scream in the most ear-splitting, piercing screams you can manage? Try to make it sound as if you're in terrible pain." The Doctor McCoy said smiling

"But vhy, doctor, you've always been gentle with me and your treatments have never caused me any pain? Apart from when you made me give zhose samples" Asks Chekov

"Yes," Said doctor McCoy in a matter-of-fact tone, "but I have a 4 o'clock drinking session with Scotty and I want to clear the line of red-shirts outside!