The original article's #20 is an internet meme taken from Lord of the Rings film where Aragorn says "One does not simply walk into Mordor". The meme is to vary the writing on a still of the film from that scene, e.g. One does not simply [do something]. For those not familiar with LoTR, Mordor is a very evil place indeed and the pronunciation of Mordor used in the film rolls the R's, much as some people on the PA do for Morden.
The underground has a station much closer to the original meme and is therefore better than the DLR.