Remember, everyone who confuses correlation and causation ends up dead.
A MySQL user and a MongoDB user walk into a bar. The PostgreSQL user doesn't understand why anyone goes to a bar when there's PostgreSQL.
Why Percentiles Don’t Work the Way you Think vividcortex.com/blog/why-perce…
Interviewing idea: instead of hypothetical hard problems, open your ACTUAL issue tracker and discuss the first 10 issues with the candidate.