It's likely stuck around for so long because the Scottish are rued as very huge lovers of mythology and tradition and such. And giving the middle finger to countries they don't get on with.
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The gold chain around the unicorn seems to be a bit of a mystery, however-- the only agreed upon sentiment was that it was probably added to show Scotland's power for taming such an indomitable beast. Apparently prior to this only virgin maidens had any hope of taming a unicorn.
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Canada apparently doesn't have as many worries (maybe we have a surplus of virgin women), because for our coat of arms we have the chain broken, which is apparently meant to symbolize freedom and defiance against oppression

So this got me curious and now I'm actually learning things.
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According to various websites (someone can correct me if this is wrong), for a long time people believed unicorns to be a very real, very powerful thing. They were considered strong enough to take on and defeat an elephant, and also symbolized purity, innocence, joy, balance, healing, strength, nobility, etc.
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The other thing it had going for it was it was apparently often pitted against the lion in the great debate of what the most powerful creature alive was (presumably none of the people in charge had ever seen a grizzly bear or a blue whale). So the lion and the unicorn became known as natural enemies.
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The lion was also the symbol of England. Scotland and England did not get along particularly well, so what better symbol for Scotland than Britain's symbol's natural enemy-- the unicorn.

Well this is a chain lock, which typically aren't designed to be open from both sides of the door. Presumably it's on the inside (unless people are being locked IN that apartment, which is much more worrisome), so unless someone else is in the apartment already, or they snuck out the window, it would never be locked.
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If they didn't sneak out the window, chances are they'd hear your drunk ass calling, and if they DID sneak out, there wouldn't be much way for you to get in shy of breaking the door, regardless of your current sobriety level

Well I was close-ish. Thanks for the clarification

Well I had honestly forgotten all about this, but thanks for taking the time to answer

Alright, but I'll have you know I'm considering you a paramedic until told otherwise. You have been warned

Guess this is motivation to delete my account if I ever leave

I think they're trying to keep a tally to back the theory that a bunch of dead accounts are being used to generate bot posts in the community

I'm so disappointed now haha

My guess would be someone who posts to imgur a lot and is female

That's actually one of the less disturbing works from the necronomicon series

@matthewg maybe I'm wrong, but arent you a paramedic as well? Or maybe I'm confusing you with someone else. Either way, you've been summoned now. Care to weigh in?

No one expects the goolies inquisition