Is there an idiom like "pot calling the kettle black" for stupidity?

Eldest brother, don't laugh at second brother-it's all bad.

Half a catty and eight taels/a half a catty and eight taels-it's the same.

There is no moon for thirty nights-every year is the same.

Crows are black the world over.

Pots and Adobe-One Kiln Product

Bitch staring at mung beans-big eyes versus small eyes

The tortoise laughs and climbs-the same as each other.

Don't laugh at the turtles, they are all resting in the mud.

Not too dark for crows.

The crow landed on the pig's back-black to black.

The crow falls on the pig-no one should think who is black.

Sheep dung fell to the ground-the same size.

The old monk chanting-exactly the same.

As salty as the water in the pond.

Zhang Fei looks for Li Kui JY-black to black.

Tiles on the house-turn over half and cover half.

The fox laughed at the cat-almost the same as each other.

The two sisters had a baby-for Tim.

A pair of drumsticks in Chenghuang Temple

Blow conch with a crooked mouth-two will do.

A crooked pot and a crooked stove-two will do.

Kiln burning and tile selling are the same goods.

Ruthless-the same.

Embroidered pillows-a pair

Stir-fried cucumber and towel gourd-same color

Monkeys laugh at rabbits without tails-just like each other.