What Should Christians Laugh At?

It seems to me that the two easiest things in the world are:

1) Making jokes that aren't funny.

2)  Laughing at things that shouldn't be laughed at.

Humor is a gift from God, but as with all gifts we must consider how to use it.  Failing to use humor properly might well endanger our souls.

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​           So what should Christians laugh at?
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In the book of Proverbs the Lord offers a warning that applies to the right use of humor, saying:

"There is a way that seems right to a man, but its end is the way to death. Even in laughter the heart may ache, and the end of joy may be grief."  
(Proverbs 14:12-13, ESV)

As we think of the right use of humor for Christians, here are some quotes that might prove helpful:

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"We should all be aware by this time that one way the devil has of getting rid of something is to make jokes about it."
A.W. Tower

"If you want to know whether a man's life is made up of frivolous or serious things, watch what he laughs at."
Anonymous 

"Nothing shows a man's character more than what he laughs at."  Johann Wolfgang von Goethe 

"Nothing is so insipid as indiscriminate good humor."
J. Gresham Machen

"There's plenty to laugh at in the world - but be sure you don't laugh at something that God takes seriously." 
A.W. Tozer

"Only a clever human can make a real Joke about virtue, or indeed about anything else; any of them can be trained to talk as if virtue were funny. Among flippant people the joke is always assumed to have been made. No one actually makes it; but every serious subject is discussed in a manner which implies that they have already found a ridiculous side to it. If prolonged, the habit of flippancy builds up around a man the finest armour plating against (God's truth)... It is a thousand miles away from joy; it deadens instead of sharpening the intellect; and it excites no affection between those who practice it."
C.S. Lewis