Wikipedia
Alcorconazo is the name given to one of the 2009–10 Copa del Rey round of 32 eliminatories by the supporters and the Spanish sports press. It received this name because of the stunning defeat of Real Madrid, one of the biggest teams in Spanish football, by AD Alcorcón, a modest team which then played in the third-tier Segunda División B.
This defeat was a lead sports story throughout Europe, being the title page in British, French and Italian publications. It also marked a rise to relative prominence for the suburban Madrid club; in what may or may not have been a coincidence, Alcorcón began a major stadium renovation project the following month.
The half-time substitution of Guti when the score was 3–0 and when he was booked before was another topic in the Spanish press because of words exchanged between the player and his coach, Manuel Pellegrini.
It generated superstition and the number of the 4–0 day, 27 October 2009, (27,109) was one of the best-selling lottery tickets on Christmas 2009.
Both matches were broadcast to the entire country on Canal +.