What's a Snafu?
The saying was originated by a couple of Army Signal Men. It became the enlisted men's recognized state of the military at the time, "Situation Normal, All Fucked Up!"

Snafu is now used to indicate any foul up.

Murphy's Law
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(Murphy was an optimist)

• Anything that can go wrong, will go wrong
  
  
• Anything good in life is either illegal, immoral or fattening
  
  
• It is morally wrong to allow suckers to keep their money
  
  
• The light at the end of the tunnel is the headlamp of an oncoming train
  
  
• Celibacy is not hereditary
  
  
• Never sleep with anyone crazier than yourself
  
  
• Beauty is only skin deep, ugly goes to the bone
  
  
• Never play leapfrog with a unicorn
  
  
• A Smith & Wesson beats four aces
  
  
• If everything seems to be going well, you obviously do not know what the hell is going on
  
  
• Never argue with a fool, people might not know the difference
  
  
• A short cut is the longest distance between two points
  
  
• Friends come and go, but enemies accumulate
  
  
• Everyone has a scheme for getting rich that will not work
  
  
• The other line always moves faster
  
  
• Murphy's Golden Rule: Whoever has the gold makes the rules
  
  
• The race is not always to the swift nor the battle to the strong, but that is the way to bet
  
  
• Anything you try to fix will take longer and cost more than you thought
  
  
• The repairman will never have seen a model quite like yours before
  
  
• In order to get a loan, you must first prove you don't need it
  
  
• No matter how long and hard you shop for an item, after you have bought it, it will be on sale somewhere cheaper
  
  
• The chance of a piece of bread falling with buttered side down is directly proportional to the cost of the carpet