Because your brain doesn't understand that it's supposed to actually be dreaming, not dreaming up ideas.

Why do spoons reflect everything upside-down?

Because they feel neglected compared to other silverware, and they wanted to have their own little quirk and get some attention.

What kind of tree grows the tallest?

The toffee tree, of course.

What's the shortest bone in the human body?

The finger bones; they get worn down from so much typing.

Which animal is the most like a superhero?

Fruit bats, who hide in caves, hang around in our Central Business District, overhear shady doings in our Botanical Garden, and see to it that nobody else has a super car that is as clean as the one which carts them away, certainly do have a resemblance to a certain superhero.

Why do empty vessels make the most sound?

Because they have nothing inside of them to absorb all the sound they make.

Why are raspberries called "raspberries"?

Because they're so tart, they make your voice raspy.

Why is sunlight yellow?

Because ultra-violet and infra-red rays of light are both filtered out of Roy G Biv's colour spectrum by our atmosphere when the Sun's light reaches Earth.

Why do newspaper reports often exaggerate the facts?

Sensationalist newspapers are actually regular, ordinary papers from an alternate, sensational world that have somehow found their way to our universe.

Why do zebras have stripes?

Because if they didn't, we'd find out if they were black with white stripes or white with black stripes!

Why don't we have the technology to make teleporters yet?

Because scientists just want to drive us all crazy from wanting one.

Why do chickens do the chicken dance?

Because they wanted to make sure no one called it the turkey dance.

What is the blandest food in the world?

Semolina pudding served up in a public hospital, meant to give the patient suffering digestive problems, a good reason to recover quickly and get out of there.

Why is a hospital without patients the best run sort of hospital?

Because without patients to complicate things, you can plan every day with the utmost regularity and never worry about silly things like "We have more patients than usual! We need more doctors!"

When will we invent self-cleaning houses?

When we're caught up on our housework enough that we have enough free time to invent new things.

Why aren't flying cars available to the general public yet?