A memorabilia dealer accusing O.J. Simpson of robbing him testified Thursday that the former football star burst into a hotel room with a handful of other men, including one wielding a gun, and carried off hundreds of collector's items. Bruce Fromong, one of two dealers allegedly robbed, said he had expected to meet with an anonymous buyer on Sept. 13, when Simpson arrived with others "in a military invasion fashion" and shouted that the items belonged to him.