What was the most difficult question that was asked during your interview at Kaiser Permanente?

The most difficult interview question(s) asked during an interview for a lateral transfer within the company (which I did not ultimately take) was about the things I dislike most about my current role and my current boss, shortly following the standard strengths and weaknesses question as well as what peers would say as areas of weakness. I didn't mind the questions themselves as a tool to identify if the new role and team would be a good fit, but having several questions in a row with a negative focus set a tone/theme for the whole interview. Overall I think that the interview style at this company is fairly balanced and effective. Having conducted interviews in my role on my current team, I can attest to the theme and underlying motivation of truly using questions to determine fit and comparability with group culture rather than seeking to surprise an interviewee with "gotcha" questions.

Probably a quiz on terms associated with the work. I knew from experience, but some interview questions would be hard to fake your way through. In general, everyone at the company knows what they're talking about - there's no nepotism or hiring friends.