“When he’s on a job, leaving fake signs and objects in his gym, at IKEA, in book stores, in chain stores, on the street or at a museum, he tries to be sneaky. Once the deed is done, ‘I run away as fast as possible,’ he says. Since January, Wysaski, a Los Angeles comedy writer who runs the website Pleated Jeans, has been planting jokes in the real world. “