This may seem a little sophmoric (is that a word?) but I have to give these guys props — not only for their creativity but for pulling this off on such a grand scale. Seems, people just do not learn. This prank was pulled in 2004 and initially in 1961.
At a recent football game, Kyle Garchar of Hilliard Davidson High School in Ohio and his pals pulled a great prank on their rivals from Hilliard Darby High School. They placed a black or white card on each seat in sections of the stadium where the Hilliard Darby fans would be sitting. Attached instructions urged the fans to hold up the cards at the start of the third quarter to spell out the message “Go Darby.” In reality, the cards spelled out… (From Boing Boing)