I've had a few where the interviewer had forgotten they had scheduled the interview so I showed up but the person doing the interview wasn't for some reason.
Most recently during my job search earlier this year I had an interview with a local "cool" tech company. I had multiple phone screens and tests that I passed without any trouble. Finally, I was called in for a face-to-face. During that interview, it became quickly clear that some of the people interviewing me had an issue with my age (late 50's). I was scheduled for a 3 hour interview and was sent on my way within 30 minutes of my arrival.
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