MIT and Caltech have been prank rivals since Spring 2005, when a group of Caltech students traveled to Cambridge to pull a string of pranks during "Campus Preview Weekend" (CPW) for prospective new MIT students. The stunts included covering up the word "Massachusetts" in the "Massachusetts Institute of Technology" engraving on the main building facade with a banner, so that it read "That Other Institute of Technology". A group of MIT hackers quickly responded by altering the banner so that the inscription read "The Only Institute of Technology".