The issue with that is that interviewers are just as contemptible as candidates. They do not have 10 spare brain teasers to ask. If you tell them "you know this

The issue with that is that interviewers are just as contemptible as candidates. They do not have 10 spare brain teasers to ask. If you tell them "you know this one" they'll either just lie or say (technically truthfully) that they "haven't been able to assess your ability". So for candidates, the fraudster approach is really the only one.