[dvh]

I once did rot13 on /lib/firmware/* (not just 13 but 0-255), piped it via 'strings' command and find longest word in English corpus (/usr/share/dict/*). I forget what I found but it's trivial to replicate.

[rwmj]

This was my best attempt at this:

  cd /lib/firmware
  ( find -name '*.xz' -exec xzcat {} \; ; find -type f -a \! -name '*.xz' -a -exec cat {} \; ) |
    rot13 |
    grep -aEo '\w+' |
    awk '{print length, $0 }' |
    sort -nsru |
    head -20

I didn't see anything very interesting in the top results.

Edit: The sort -u option hides words of the same length. Removing that option (and the head command) gives more results, but nothing that interesting.