100+ Answers
Michael Godfrey, Engineer, Programmer, Easily distracted individual

I see a few detailed answers here, which in sure are helpful for many. I'll offer a simple one now, based on my own anecdotal experience.

It's on your vehicle registration

Boom, there it is.

I lost my ID once after a night out, and the website to replace your drivers license requires the number. That's the situation that I was in, and this was the solution to my problem.

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