Please don't Hodor: New York subway's new heartbreaking sign

Warning: This article contains spoilers from Game of Thrones Season 5, Episode 6
Until and unless you have been living under the rock you must have known by now that Game of Thrones latest season is halfway and it takes over the internet by storm every Sunday when a new episode is aired.
The latest episode titled "The Door" also finally revealed the reason why Hodor only spoke one word 'Hodor.' Hodor stood for 'Hold the door,' the last thing Hodor heard as he attempted to block a hoard of White Walkers from killing Bran.
As Hodor's death unleashed a bunch of memes over the internet, the public transport authority of New York, MTA (Metropolitan Transportation Authority) also decided to use a Game of Thrones reference and released a new ad for its commuters saying 'Please Don't Hodor.'
Image: Reddit
Recently, the viewers were overwhelmed when one of the fan-favorite characters Jon Snow, resurrected in the second episode. But the series famous for abruptly killing off important characters, gave one of the most heart wrenching shocks, when Bran's caretaker and friend Hodor died.
Apart from the New York subway, someone made the dull elevator ride fun:

Then, this guy explains viewer's reaction in a Hodor gif:

Another Twitterati made this sweeping declaration:

The meaning of chivalry has changed for this GoT fan: