Interesting collection of some of the best marketing promotions making advantage of the current Tube strike in London (last week, 2 days; and 2 days planned this week, but I am learning that Transport of London has just called the strike back).
Interesting to see, but not really a surprise, twitter and social are preferred channels for these real-time promotions, with few exceptions.
Humour is broadly used across all campaigns. And so is sales discount, which is a good lever and works particularly well in situations like this.