These are called paraprosdokian sentences. The first half has one meaning and the second sentence gives the phrase a whole new meaning:

A bus station is where a bus stops.  A train station is where a train stops. On my desk, I have a work station.

If I agreed with you, wed both be wrong.

We never really grow up, we only learn how to act in public.

War does not determine who is right - only who is left.

Knowledge is knowing a tomato is a fruit; Wisdom is not putting it in a fruit salad.

Politicians and diapers have one thing in common. They should both be changed regularly, and for the same reason.

The early bird might get the worm, but the second mouse gets the cheese.

Evening news is where they begin with Good evening, and then proceed to tell you why it isnt.

To steal ideas from one person is plagiarism. To steal from many is research.

If God is watching us, the least we can do is be entertaining.

If you think nobody cares if youre alive, try missing a couple of payments.

How is it one careless match can start a forest fire, but it takes a whole box to start a campfire?

Some people are like Slinkies ... not really good for anything, but you cant help smiling when you see one tumble down the stairs.

Dolphins are so smart that within a few weeks of captivity, they can train people to stand on the very edge of the pool and throw them fish?

I thought I wanted a career; turns out I just wanted pay checks.

A bank is a place that will lend you money, if you can prove that you dont need it.

Never, under any circumstances, take a sleeping pill and a laxative on the same night..

I didnt say it was your fault, I said I was blaming you.

Why does someone believe you when you say there are four billion stars, but check when you say the paint is wet?

Women will never be equal to men until they can walk down the street with a bald head and a beer gut, and still think they are sexy.

Why do Americans choose from just two people to run for president and 50 for Miss America ?

Behind every successful man is his woman. Behind the fall of a successful man is usually another woman.

A clear conscience is usually the sign of a bad memory.

You do not need a parachute to skydive. You only need a parachute to skydive twice.

The voices in my head may not be real, but they have some good ideas!

Always borrow money from a pessimist.  He wont expect it back.

Hospitality: making your guests feel like theyre at home, even if you wish they were.

Money cant buy happiness, but it sure makes misery easier to live with.

I discovered I scream the same way whether Im about to be devoured by a great white shark or if a piece of seaweed touches my foot.

Change is inevitable, except from a vending machine.

Do not argue with an idiot. He will drag you down to his level and beat you with experience.

I want to die peacefully in my sleep, like my grandfather.. Not screaming and yelling like the passengers in his car.

Going to church doesnt make you a Christian any more than standing in a garage makes you a car.

The last thing I want to do is hurt you. But its still on the list.

Light travels faster than sound. This is why some people appear bright until you hear them speak.

I asked God for a bike, but I know God doesnt work that way. So I stole a bike and asked for forgiveness.