I stumbled upon the Apple (AAPL) chart and was struck by how cleanly that trendline has changed roles. The stock bottomed on March 23rd (of course) at a low of 52.91 and, after peaking with a 160% gain (!!!) it has lost about 20% of its value. Click on the chart, and you will how, since September 17th, the exact line that was reliable support is now a ceiling.
Long-term, EBAY has done the same thing.