Somehow the normal "Chk!" noise when you select a menu option got replace by a muppet sounding "aha!" I have disabled ALL of my mods and it is still there. I have no idea how, when, or why this has happened. it's hilarious but I also want my old sound back. can anyone explain this?

http://www.youtube.com/watch?v=3TQVptS53Ao&feature=youtu.be