i actually got the information from hyper magazine but its also on this site> www.joystiq.com/ if you look closly on the boxart at the title there are small stars on a few letters. on the word super the u and the r have a star on it on the word mario m and r have a star and on galaxy the g the second a and the y spelling U R MR GAY SU*PER* M*AR*IO G*ALA*XY* i thought it was interesting =)
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http://www.joystiq.com/2007/09/18/u-r-mr-gay-message-discovered-in-super-mario-galaxy-box-art/