What kind of weirdo doesn’t know how to use fruit or sports equipment to describe how big something is?
Did you know the average apple is one baseball in volume?
And 1/3 of a Smurf high.
The best unnatural units are wildly inappropriate in scale. When measuring things like ships and planets I prefer Peeps as the unit of mass.
At roughly 10g = 0.375oz per each, it takes a very large number to outweigh a ship, a building, or a planet.
Conversely the Moon is an excellent unit of mass for measuring quantities for cooking at home.
The metric barn is fun.
How many metric barns in Robin Hood’s barn?
The reference here is that Robin Hood’s barn—i.e. the land around his territory—was all the open pastureland around Sherwood Forest.
One of my professors used to measure the sugar for his tea in barn-kiloparsecs. Which turns out to actually be a reasonable unit: There’s about three barn-kiloparsecs in a teaspoon.
Also, an acre is exactly the area of a rectangle 99 miles long by 1 inch wide.
You are thinking of Bovine units, which only have a radius.