Really wish more interviews were like this. My favorite onsite interview was when the interviewer printed out a class from the actual system I'd be working on (as I verified for myself later), asked me to figure out what it did, any errors I found, and a few ideas to improve or refactor it. Then he took my code sample and asked me to describe what it did as well.

After that he said "Okay, I know you know enough to handle the job, now I'm curious how much you really know. " (This is key, I feel. He specified I wasn't going to get dinged for not knowing the answers, so I didn't feel the pressure in the questions he asked afterwards, when I usually feel intense pressure, as I know I've been passed over for getting a single question wrong in multiple interviews in the past.) He then asked me some pretty deep questions about low level memory and other things, and if I said I didn't know he turned into teacher mode and taught me the concept.

I actually walked out of that interview having learned something new and useful. I then got to chat with the President very casually, and I received a job offer a few days later.

The interviewer new his stuff, too. He'd been programming arcade games in assembly for decades. His games have sold millions of dollars, and two of the series still get made today.

Ever since, I figured if a freaking legend could be satisfied after reviewing some code and a code sample, the crap I've had to endure everywhere else is completely and totally unnecessary, and it's just frustrated me to no end.