Is Yahoo! a trick or a treat?  Is GM a trick or a treat?  In today's special Halloween edition of MarketFoolery,  we tackle those questions and share some additional treats.

European leaders beef up the bailout.  Exxon Mobil and Royal Dutch Shell report big profits on higher oil prices.  And Visa reports higher profits on increased credit and debit card activity.

Shares of Amazon drop after the company reports a decline in quarterly profits.   Shares of Ford slide despite big quarterly sales.  And shares of Tupperware tumble despite strong sales in emerging markets.

Shares of Netflix tumble after the company reports worse-than-expected subscriber loss.  Shares of Under Armour rise on better-than-expected earnings.  And 3M reports weaker-than-expected earnings and warns of weakening consumer demand.

Caterpillar reports big earnings.  Google eyes Yahoo!.    And Mattel makes a big bet on Thomas the Tank Engine.

Microsoft CEO Steve Balmer shares his thoughts on Google.  eBay and Nokia report earnings.  And markets respond to the events in Libya.

Apple reports weaker-than-expected earnings.  Intel reports stronger-than-expected earnings.  Visa increases its dividend.  And KFC debuts the Cheesy Bacon Bowl.

Coca-Cola reports strong international growth.  Goldman Sachs reports a rare loss.  And shares of IBM slip after the company reports weaker-than-expected sales.

Our analysts discuss two stocks that are overrated, two stocks that are underrated, and two stocks that have been overlooked.

Shares of JP Morgan tumble in the wake of earnings.  AOL considers a sale to Yahoo!  And rumors swirl around a potential Google acquisition of Akamai.