These are some Murphy's Law examples:
-A slice of buttered bread, when dropped from a height, will always land butter-side down.
-Gerrold's Laws of Infernal Dynamics #1: If an object is in motion, it will always be going in the wrong direction
-Gerrold's Laws of Infernal Dynamics #2: If an object is stationary, it will always be in the wrong place.
-Left to themselves, things tend to go from bad to worse.
-Everything takes longer than you think. Or, everything takes twice as long as it should; excepting that which appears easy, taking three times as long.
-Nothing is as easy as it looks.
-The first 90% of the job takes the first 90% of the time. The second 10% of the job takes the second 90% of the time.r
-Just when you see the light at the end of the tunnel, the roof caves in.
http://library.thinkquest.org/05aug/01537/examples.html
Basically, from this site, we can know that everything or anything will goes wrong no matter what happen. For my understanding, from this law, we know that nothing is impossible and nothing is possible. Everything is 50:50. For example, "Winning the lottery happens to everyone else", or we are overlooked somehow,when we think that everytings seems to be easy.For design, a single simple photo has tells it all, is more than a thousand words somehow.