Lovers lock eyes; they lock arms and lips and they also lock … locks. Modern legend says the custom of writing names on padlocks and clamping them on wrought-iron fences, bridge guardrails and other unmoving and clamp-able objects began in Serbia sometime around World War II.
A young woman named Nadia fell in love with a soldier who went off to fight in Greece. He, of course, fell in love with a Greek woman and broke off his engagement with Nadia and she died of a broken heart. After that, young Serbian couples started writing their names on locks and clamping them on the bridge where Nadia and her boyfriend once met.