If you are going to introduce new units, you should at least include the 
Potrzebie, invented by teenager Donald Knuth and published in the humor 
magazine Mad Magazine #33.  The system is based on the thickness of Mad 
Magazine #26, equal to 2.2633484517438173216473 mm.
See the Wikipedia entry for 'potrzebie' for more information, or search for 
suitable images.

Honestly, I don't know how Knuth resisted putting this in plain TeX.
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