Here's why this Gaga Performance is legendary:

[mmkay 835]

When the performance starts and the girl is like: "We love you..", and then the booing starts.
 

AND also cause Gaga is a F'iiing PRO doing this. To proof, here's Alaska doing the same shiiit, but the costume change does not work so well. 
 

We still love you Alaska! HIIIIIIIIIIIIIIII!!!!!!!!!!!!!!!!!!!! btw, where are your heels?!