LSU again majors planted contrasting grass seed in Tulane stadium that spelled out "LSU" after their home game before a bye week one time. They knew it would grow at a rate that it wouldn't be discovered until the grounds crew cut the grass the day before the LSU game.
Here's some more stories... http://www.tigerdroppings.com/rant/lsu-sports/outrageous-moments-in-tiger-stadium-history/52088620/