Daylight saving has been used in the United States and in  many European countries since World War I, when the system  was adopted in order to conserve fuel needed to produce  electric power. If more of the waking day was during daylight hours, fewer lights would need to be burned. The law,  however, proved so unpopular that it was later repealed in  1919.

During World War II, the United States observed year-round  Daylight Saving Time. But after the war, since there was no  federal laws, states were free whether to observe or not to  observe DST. That got confusing. One popular story goes that  on the 35-mile stretch of highway between Moundsville, West  Virginia, and Steubenville, Ohio, every bus driver and his  passengers had to endure seven time changes! To curb the  resulting chaos the United States passed The Uniform Time  Act of 1966. And with a few small modifications it has been  this way ever since. 

A linguistics professor was lecturing to his class one day. "In English," he said, "A double negative forms a positive.
In some languages, though, such as Russian, a double negative is still a negative. However, there is no language wherein a double positive can form a negative." 
A voice from the back of the room piped up..."Yeah, right."

Do not walk behind me, for I may not lead.
Do not walk ahead of me, for I may not follow.
Do not walk beside me, either.
In fact, just leave me the heck alone.