I've been the mate on watch when its been done on numerous occasions. I almost got use to it after a while.
We had a KP cadet onboard one time. He was standing next to me by the throttles, we were down bound at night. I could see the lights of another ship coming up on us. The Captain and the Pilot were well aware of the ship too, but this cadet wasn't. He asked to borrow my binoculars. So I watched him as he put them to his face, looked for a second then just turned and looked at me with this dumbfounded look. "sit tight and watch!"