"Bulletproof" went to #1 in the UK, and also topped the U.S. Hot Dance Club Play charts in the Summer of 2009. Singer Elly Jackson explained this song to the BBC Newsbeat program: "For me Bulletproof is just about looking at a situation that's usually a reoccurring one. It could be to do with anything in your life - whatever you want it to be about." (Source Bulletproof Songfacts).
Been there, done that, messed around
I'm having fun; don't put me down
I'll never let you sweep me off my feet