What makes us laugh?

What is funny to you and what is funny to someone else?
The things that make us laugh countless.
Things that can make us laugh like a comedy, books, cartoons, comedian and all who can tell a joke or funny in a way completely different from what we've seen and heard.

Sometimes, Why do we laugh at other people?
Is to become a habit in our lives, we often laugh at others?
Was it when they make fools of themselves, or suffer from an unfortunate accident AAU is not on purpose?

Here are some good examples of ignorant people and make themselves and the general public to enjoy and laugh at it.
The first example, several years ago during a summit in Okinawa. Then Japanese Prime Minister Mori was to welcome U.S. President Bill Clinton.
Mori does not have the English skills that he taught some basic English conversation before Okinawa summit and Bill Clinton ...

Mori told that
  "When you shake hands with President Clinton, saying 'how are you doing'.
Then Mr. Clinton should say, "I'm fine, and you?"
Now you have to say 'me too'. After that our interpreter staff will take over "

Now this is the part where we can laugh. When Mori met Clinton, he mistakenly said "Who are you?" not "How". Clinton surprised but still respond and do so with a sense of humor. Clinton's answer was: "Well, I'm Hilary's husband,

ha-ha ....". Mori replied "Me too, ha-ha .."

Another example is a quote from famous people.
"Smoking kills. If you're killed, you've lost a very important part in your life." This sentence in katakana by Brooke Shields, during an interview to become spokesperson for federal anti-smoking campaigns.

"Those who survived the San Francisco earthquake said," Thank God, I'm still alive. "But, of course, the people who died, their lives will never be the same again." - Barbara Boxer, Senator

"The reports were incomplete, but we've heard that in the first heart transplant operation in Belgium, both patient and donor fine." - Radio news announcer

"Facts are stupid things." - Ronald Reagan, Former U.S. President
But why do we laugh at other people? Because we want to reduce stress.