You know what's fun? When your production database has 10 million records and somehow you get a UUID collision. The math says it's basically impossible—we're talking astronomical odds here, like 1 in 2.71 quintillion for standard UUIDs. But here you are, staring at your logs at 2 PM on a Friday, debugging why two completely different users have the same "unique" identifier.
Sure, the probability is low enough that the heat death of the universe will probably happen first. But "never zero" means some poor soul out there has experienced it, and now you're paranoid enough to add collision checks "just in case." Welcome to programming, where we plan for events that statistically won't happen in our lifetime but somehow still keep us up at night.
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