What idioms are there about stupidity?

Stupid,

Gong Yu moved mountains,

Even the smartest person is stupid,

Stupid husbands and stupid women,

A fool has a thousand troubles and a harvest.

Stupid and ineffective,

Become stupid and obsessed,

Smart men and stupid women,

Fools become saints,

A fool gets a fool,

The stupidity of money,

I'm not stupid,

The wisdom of poor fools,

Diligent and dull,