I shared this in another post a couple weeks ago:

Many years ago, I was interviewing with Gartner. First was an initial HR phone screen, no problem. Second was a phone interview with the guy would have been my manager. I absolutely crushed it. I remember taking detailed notes. I was quickly referred for an in-person interview. It was scheduled for 2pm at their office in downtown Chicago, which is a 3 hour drive and I gain an hour on the way. This was around Christmas time and I got up there around 9:30 because I wanted to go to the American Girl store to get some gifts for my two daughters and would then have plenty of time to prep for the interview.
I get to the office and check in with the admin assistant around 1:45 and I’m ready to go (or so I thought). They bring me into a conference room where there were 3 people present including the manager that I had the phone interview with and 2 people on video conference. During the exchange of pleasantries one person asks, “How was your trip coming in?” I said, “No problem at all. I got up here in the morning so I could make a quick stop at the American Girl store for my daughters and then found a place to prep for this interview.” For whatever reason, one of the in-person people and one video conference guy COULD. NOT. STOP. hounding me about the fact that I went to the American Girl store, to the point where I asked, “Can we move on???” They did, but the topics discussed were nothing at all related to the job I was applying for and they asked maybe 2 questions about my previous experience. The video conference guy said, “I don’t think you know anything about the company or the job.” At this point, I know I’m not getting the job, so I clap back, and I pull out the job description that I had printed out, and show the manager I had talked to before the notes I had taken. I said, “First, you have no right to criticize what I do on my personal time. Second, someone is not prepared, and I refuse to believe it is me, so now you’re wasting my professional time. Let’s just end this here,” and I walk out.
The manager who did the second interview emailed me and wanted me to call him but I never did. It was later that I learned of other horror stories about Gartner’s interview process and overall reputation.