The Mirrorball Man wrote:
What was wrong with that joke?
Because it takes you out of the interal "reality" of the series and into a scene that would be more suited to an episode of 'League Of Gentlemen'.
As DW fans we're used to handwaving all sorts of dodgy science and plot points in order to have the episodes make some kind of sense. But there's no internally logical way of explaining why a 19th Century urchin is talking like a 21st Century SatNav. It's a comedy sketch joke, though thankfully less offensive than the Sonic Screwdriver getting an erection was. (At least a blow-job dispensing Paving Slab made some sense.)