It's because he isn't unique. There's always amumu here and amumu there, here a mu, there a mu, everywhere amumu.
Interactive Joke of the Day Mug
Coffee Mug
Mu
Cheap cheap!
Anne apple just fell on my head !
A monster that climbs up the Empire State Building and catches aeroplanes with its tongue.
She became a sleeper agent
Shanghai
Get off Mu-lan!!!"
Con-Descending
Moose-saka
Amumu
Get them back inside the camp!"
Concentration camp.