Mandel Watch. #003:
Traditionally, whenever briefcase thirteen is opened, the audience usually issues a low hush. Up until the 2005 season of the show, when number twenty-six was opened, the audience let loose with a loud shout of "boo yeah!" for no apparent reason. The shout of "boo yeah" was later abandoned in the 2005 season onwards, seemingly because it made the show's rules appear overly complex to the casual viewer.
-- excerpt from Deal or No Deal's Wikipedia entry.
Let us all pray that Mandel sacrificies a bit of rule complexity and brings back the "boo yeah" [sic].