Ooops! I even knew the stairs were the megaphones! Don't know why I said that!! But like mdhkitten said, I think it is the whistle at All Star Sports, as well!
There are some FANTASTIC threads around here with DCL pictures, so I've been stocking up and getting excited.
I just told DH that I never get these pictures because I haven't been to WDW as many times as other people... but apparently that isn't the answer -- looking at pictures must be it!