Free coffee alert! Tomorrow, Starbucks will launch four days of buy-one-get-one action to promote their seasonal holiday beverages. From 2 to 5 PM, you can go in with a friend and score an extra peppermint mocha, gingerbread latte, eggnog latte or carmel brulee latte and get another one for free. The giveaway runs from November 15 to the 18. The real question? How many free coffees can you drink in that sort time span?