Black Friday Sale more than 50.000 users simultaneously accessed the site, temporarily causing delays and server overloads. The overwhelming numbers of visitors also caused the servers of several online shops, such as the electronics store Saturn, to suffer significant downtime. Despite the technical problems, the first Black Friday Sale generated a significant turnover and was considered a notable success by online retailers and organizers alike. After successfully launching in 2013, and having a successful 2014, 2015 and 2016, the Black Friday Sale is set to return on 24 November 2017. Online shoppers are expected to spend billions on this Black Friday sale. Once
Friday the 13th the last two years, Dutch insurers received reports of an average 7,800 traffic accidents each Friday; but the average figure when the 13th fell on a Friday was just 7,500." In years which begin on the same day of the week and are of the same type (that is, whether they are a common year or leap year), Friday the 13th occurs in the same months. This sequence, given here for 1900–2099, follows a 28-year cycle from 1 March 1900 to 28 February 2100. The months with a Friday the 13th are determined by the Dominical letter (G, F, GF,