I was on a tube earlier, as sometimes happens. A southbound Bakerloo line train, to be precise. Some Americans (they sounded like Texans to my (admittedly poorly trained) ears) got on at Embankment, and were horrified to discover that the train then stopped at Waterloo, rather than at Charing Cross, which was where they were going. Now, I know that the tube is confusing to those who haven't used it before, but... when I mentioned to them that this train was heading south (the clue being in the word “southbound”), one of them exclaimed, “Why didn't they say this thing has directions?!”.

Uhm.

They spent so long complaining about this that they failed to get off at Lambeth North (oh, non-Londoners might want a tube map), so they'd just have to stay on the train at Elephant and wait for it to go back the way it came. It took a few of them quite some time to understand this, too. They apparently thought that after Elephant the tube would magically appear at the other end of the line and go south again, rather than going north.

Uhm.

10-year-old boy on bike, to different 10-year-old boy on different bike, in a serious tone: Yeah, you see, my cat has a tendency to attack newcomers.