"Which one?"
"Any one."
One of the major difficulties Trillian experienced in her relationship with Zaphod was learning to distinguish between him pretending to be stupid just to get people off their guard, pretending to be stupid because he couldn't be bothered to think and wanted someone else to do it for him, pretending to be outrageously stupid to hide the fact that he actually didn't understand what was going on, and really being genuinely stupid. He was renowned for being amazingly clever and quite clearly was so — but not all the time, which obviously worried him, hence the act. He proffered people to be puzzled rather than contemptuous. This above all appeared to Trillian to be genuinely stupid, but she could no longer be bothered to argue about it.
She sighed and punched up a star map on the visiscreen so she could make it simple for him, whatever his reasons for wanting it to be that way.
"There," she pointed, "right there."
"Hey ... Yeah!" said Zaphod.
"Well?" she said.
"Well what?"
Parts of the inside of her head screamed at other parts of the inside of her head. She said, very calmly, "It's the same sector you originally picked me up in."
He looked at her and then looked back at the screen.
"Hey, yeah," he said, "now that is wild. We should have zapped straight into the middle of the Horsehead Nebula. How did we come to be there? I mean that's nowhere."
She ignored this.