Mean Girls (Mark Waters; 2004) » never-ending list of favourite movies “Calling somebody else fat won’t make you any skinnier. Calling someone stupid doesn’t make you any smarter. And ruining Regina George’s life definitely didn’t make me any happier. All you can do in life is try to solve the problem in front of you.”
This is a bridge in Paris. You hang locks on it with the name of you and your boyfriend/girlfriend/best-friend then throw the key into the river. So even though the friend/relationship may end, you can’t remove the lock. It stays there forever, as relevance to someone once a part of your life.