Water, water everywhere
Everything but the kitchen sink
By no stretch of the imagination
Food for thought
Laughter is the best medicine
100

A man goes out in heavy rain with nothing to protect him from it. His hair doesn't get wet. How is that possible?

What is he is bald?

100

What invention lets you look right through a wall?

What is a window?

100

When you look for something, why is it always in the last place you look?

What is because when you find it you stop looking?

100

Take off my skin; I won't cry, but you will. What am I?

What is an onion?

100

Why did the skeleton not go to the party?

What is because he had no body to go with?
200

What kind of coat is always wet when you put it on?

What is a coat of paint?

200

I never ask questions but am always answered. What am I?

What is a doorbell?

200

What can you catch but not throw?

What is a cold?

200

What's orange and sounds like a parrot? 

What is a carrot?

200

Where would you take a sick boat?

What is to the dock?

300

What is full of holes, but can still hold a lot of water?

What is a sponge?
300

You put me in the ground when I am alive and dig me up when I am dead. What am I?

What is a plant?

300

What is harder to catch the faster you run?

What is your breath?

300

What has to be broken before you can use it?

What is an egg?

300

Why does the golfer wear two pairs of pants?

What is in case he gets a hole in one?

400

You can see me in water, but I never get wet. What am I?

What is a reflection?

400

Take me for a spin and I will make you cool. Use me in the winter and you are a fool. What am I?

What is a fan?

400

Imagine you are in a dark room. How do you get out?

What is stop imagining?

400

What table can you eat? 

What is a vegetable?

400

What time is it when an elephant sits on the fence?

What is time to fix the fence?

500

What runs, but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

What is a river?

500

You may enter but you may not come in, I have space, but no room, I have keys, but open no lock. What am I?

What is a computer?

500

I can bring tears to your eyes; resurrect the dead, make you smile and reverse time. I form in an instant but last a lifetime. What am I?

What is a memory?

500

First you throw away the outside and cook the inside. Then, you eat the outside and throw away the inside. What am I?

What is corn on the cob?

500

When is a door no longer a door?

What is when it's ajar?