Beowulf

The real reason golfers are not allowed to wear large buttons on their shirts is because during a swing, the button could pop off, fly into the gallery and hit someone in the eye. That person could scream, causing a police officer to panic, thinking there is a terrorist attack taking place, and his firearm could accidentally discharge, the bullet striking a telepone pole's transformer, causing it to explode in a huge shower of bright sparks. The sudden surge in electricity could conceivably affect the nearest NORAD radar station, causing blips resembling incoming thermonuclear missiles to appear on the radar screens, and in the panic, it will never be known who accidentally launched our missiles, thereby causing the end of the world.
Gotta play it safe after all.