Awhile ago, I bought an electronic trading stock, ICE, on sheer gut feeling at 100. I purchased strictly to see if I had the discipline the old "sell if it goes above 15% or below 8%". I sold it at 117, it zooomed to 160 or so in the next few weeks, and is hovering around 137, according to my Dashboard. I still keep it on my Dashboard as a cautionary tale. Still seeking wisdom.......Knowing when to sell, the hardest decision in all of investing....