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Fun way to find random documents. Go to Google search, and search for

filetype:pdf the

Feel free to replace the word "the" with any other innocuous word. You'll get a bunch of random PDFs.

Another fun constraint:

filetype:pdf site:org the

This will return PDFs by ".org" domains (mostly nonprofits) so you get a bunch of random reports.

Also try

filetype:pdf "internal use only"