Investors were surprised by the big rally in the stock market on Thursday, but Friday brought another dose of reality and disappointment. After having posted monumental gains despite high readings on inflation, the Nasdaq Composite (NASDAQINDEX: ^IXIC) closed at its worst level of the year, and the S&P 500 (SNPINDEX: ^GSPC) and Dow Jones Industrial Average (DJINDICES: ^DJI) gave up most of their advances from earlier in the week. One of the biggest stock stories of the past several years has been Tesla (NASDAQ: TSLA).