Depends on which one! So here are a handful of 4 worders.
Money does buy Happiness
R'lyeh wgah'nagl fhtagn
Princess in another Castle
Wanna join my gang?
Advent: Brave New World
Viking in Space
Freedom Loving Star Foxes,
P-p-p-pick up Pacifist Penguin
The Apex species
Britannia rules the stars