There are many measurement systems, and the ones by Système international and the imperial system are arguably two of the most famous. There are also the furlong-firkin-fortnight (FFF) system and the CCC system by Jan Misali, both of which are sarcastic systems made as a joke. I have here a system that falls into the latter category that aims to be as difficult to use as possible. Here are the base units:

Let’s try to derive the units for some common dimensions.

Length

We know volume is represented by $gal$, so $\sqrt[3]{gal} \approx 0.1558491279 m$ is our unit of length.

Time

We can’t use $Ba$ nor $\epsilon_0$, since those have $kg$ and $C$, respectively, that needs to be removed by multiplying its own reciprocal, which cancels itself out. That leaves us with $gal$ and $g$ to be manipulated. Time can be represented by seconds, so we have

We can replace $\frac{s^2}{m}$ with $g^{-1}$ and $m^3$ with $gal$ to get

Velocity

Velocity is acceleration times time, so

Mass

We can replace $\frac{kg}{m \cdot s^2}$ and $m^2$ with $Ba$ and $\sqrt[3]{gal^2}$, respectively, to get

Force

Force is mass times acceleration, so

Momentum

Momentum is mass times velocity, so

Energy

Energy has the same units as work, which is force times distance, so

Electric Charge

We can replace in $\epsilon_0$, momentum, velocity, and length accordingly:

Electric Field

Electric Field is force per charge, so

Voltage

Voltage is energy per charge, so

Capacitance

Capacitance is charge per voltage, so

Current

Current is charge per time, so

Resistance

Resistance has the same units as vacuum permittivity divided by velocity, so

Temperature

We can replace in $c$ and velocity accordingly:

What about luminous intensity and substance amount?

I don’t know how luminous intensity works so I can’t list an overcomplicated version of it. But feel free to use candela.

For substance amount, I don’t know any established units that are in the range of Avogadro’s Number that are ridicuous, so I’ll just say the Baker’s Dozen $(13)$ works.