A museum tested evening opening hours on Fridays for visitors who could not arrive before six. The trial lasted four weeks. Staff counted more Friday visitors than during the preceding month, while Saturday attendance remained unchanged. The report did not measure visitor satisfaction or compare travel costs. A newspaper nevertheless described the trial as proof that longer hours made every visitor happier. The curator asked for a correction. Higher attendance on one day was evidence of a change in visits, not evidence about the feelings of every visitor. She also noted that a free exhibition had opened during the trial, so the increase could not confidently be attributed to hours alone. The museum decided to continue counting visits while adding a separate satisfaction survey. Its next report would distinguish observations, possible explanations, and questions that had not yet been answered.