Although "Mexican waves"--the undulating effect fo a crowd of spectators jumping to their feet and waving their hands in the air like they just don't care--have long been part of stadium entertainment, the term was only coined during the 1986 World Cup in Mexico City. Research into these waves (known also as La Ola) by Illés Farkas et al. [Nature 2002; 419:131-2] indicates that waves usually move in a clockwise direction at an average speed of 12m (c.20 seats) per second. They tend to be 6-12m (c.15 seats) wide, and can be instigated by only a few dozen spectators. Mexican waves at Lord's (the spiritual home of cricket in London) circle the ground but cease temporarily between the Allen and Warner Stands while the wave passes invisibly through the MCC members' seats in the pavilion. The restraint of the members is usually accompanied by a humorous chorus of boos.
"Believing in tychism, I purchase lottery tickets."