Some people can pull of disguises very well. Arnold Schwarzenegger is NOT one of those people. Granted, the disguise that Arnold is wearing in this video isn't that extensive, but still. His voice is a dead giveaway and he looks just like Arnold Schwarzenegger.
In this video, he's "going undercover" at a Gold's Gym in Venice, CA to promote health and fitness and the After-School All-Stars Program. Some people are fooled. Most are not.