Not nearly as good as your example but primary key selection is often a great indicator. I recall Joker.com (domain registrar) uses your email address as primary for your entire account. Choose wisely. Should you ever need to change it (that never happens, does it?) you'll need to sign up for another account and go through multiple physical "letterhead" mailings to transfer each domain from your old email address/account to the new. Oh, and they're in Germany so the turn-around is glacial.
Hopefully they've changed by now, but I also recall unhappy responses to my WTF/freshman programming/alternate primary key suggestions.
Too many stories... But one of my favorite incidents was caused when our team shared code with a nameless large company to help their guys get beyond some really inane race conditions generated by their in-house compiler. These were large project on both sides yet the code share was done without the usual legal/management filters. Thus nobody properly sterilized the code comments which after a couple years were littered with our project lead's (a colorful guy by any measure) vociferous rants about why we had to special-case for said software company's products, their team's certain inbreeding, you name it. Team members past and present had responded in other comments and by creative variable name choices, making the source code an entertaining if almost Lampoon-ish read. From our perspective anyway. I was very happy the transfer and fallout happened while I was on vacation.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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