Video game stocks dropped Tuesday after an analyst predicted that June packaged video game sales will come in down 39% from a year ago and social game playing will fall a third straight month. Sliding activity challenges outfits like Walt Disney (DIS) and Zynga (ZNGA), maker of "Farmville" and other social games often played on Facebook (FB), as well as makers of traditional PC and console games such as Electronic Arts (EA), Take Two Interactive