Pictures:

How do trash collectors learn their trade?

They pick things up as they go along.

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Why couldn't the leopard play hide and seek?

Because he was always spotted.

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What is blue and smells like red paint?

Blue paint.

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Why didn't Joe buy camouflage trousers at the store?

He couldn't find them.

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What has a head and a tail but no body?

A coin.

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