Pictures:

What is ironic when we eat food because we don't want it to go to waste?

Often that's the food that DOES go to waist.

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What do you call a ball that looks like the earth and lights up?

A global glow ball.

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Why was Billy very careful blowing out the candles on his birthday cake?

This was his big birthday party, and he didn't want to blow it.

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

He couldn't find them.

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What do skyscrapers and libraries have in common?

They have a lot of stories.

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What is a punster's favorite vegetable?

Corn (you knew that).

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Why can't you trust a staircase?

It is either up to something, or letting you down.

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When Bobby threw a ball as hard as he could, why did it just come back to him?

He threw it up in the air.

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Why did the homeowner get upset that he had to install this?

He just needed to vent.

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How did Fred feel when he opened the cupboard and a glass jar fell on his head?

He found it very jarring.

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How can you hold air?

By holding your breath.

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How did Jeff feel when his favorite porpoise in the aquarium was very sick?

He felt like he no longer had a porpoise.

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