I liked the one with the London Marathon that was very close to April 1.
The Beeb showed footage of long distance endurance running in Japan where they will cover loads and loads of miles over say a week.....They then showed two Japanese runners going through the London finish and jogging away (obviously running down slowly to counter lactic acid) - and how they probably did not understand that this was the finish.
Chaos in London as folk were approaching Oriental joggers and trying to indicate to them that the race had ceased.......