Universal’s Harry Potter and the Forbidden Journey has bedeviled many big and tall riders who discover at the last moment that their journey aboard the new attraction is indeed forbidden because they don’t fit in the “enchanted benches.” The uncomfortable scene is a familiar one to anybody who has ever visited a theme park: The overweight rider becomes increasingly embarrassed as the ride attendant pushes and shoves with all his might on the over-the-shoulder restraint that stubbornly refuses to click closed. Everybody waiting in line knows what comes next: the walk of shame. “The walk of shame is an embarrassing...