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Some years ago a movie called
"Tre metri sopra al cielo" (roughly
three meters above Heaven) had a great success among teenagers. It was a typical teenage movie about difficult love and broken promises of eternal love. In one scene, the two main characters put a padlock on a bridge in Rome, with their names on it, and throw the key in the Tevere.
This movie became so popular that on walls you can read graffiti saying 3MSC (the acronym of the title) and on many bridges, including this one in Portogruaro, you can find padlocks promising eternal love.