When interviewing someone for a more senior position, I would always ask, "What was your worst [work-related] mistake?" If they couldn't come up with anything,

When interviewing someone for a more senior position, I would always ask, "What was your worst [work-related] mistake?" If they couldn't come up with anything, they were either lying or they just coasted through their previous jobs. If their answer was mostly about how it was really someone else's fault, then I'd consider them lacking in the kind of attitude I consider important in a co-worker.