I guess it's something that happens all to often at sporting events - but people certainly notice when it happens at the Super Bowl.  Christina Aguilera attempted an acapella version of the anthem this year.  Her singing was ok - but she flubbed the words.  Hey - it's the national anthem!  The words mean something.   It seems so many anthem singers are more concerned with these "stylized" versions, rather than just singing the song the way it was written.    So once she blew the lyrics it didn't matter what she did after that.  In case you didn't hear it - check it out: