I was once asked a very very specific question about a conflicting setting in an nginx config and the dude actually wrote the config on the whiteboard and asked me how I would make it work.
I stared at it for what felt like minutes and then said, if I looked in your search history would I see you looking this up on stackoverflow?
The guy said "yes" and I said I would make it work by asking you to send me the link to the stackoverflow answer.
He laughed and said "you got me".
Same company different interviewer asked me to explain the "pros and cons of Java vs Rails."
I stared at it for what felt like minutes and then said, if I looked in your search history would I see you looking this up on stackoverflow?
The guy said "yes" and I said I would make it work by asking you to send me the link to the stackoverflow answer.
He laughed and said "you got me".
Same company different interviewer asked me to explain the "pros and cons of Java vs Rails."
I turned the job down.