Oh my goodness, cannot believe we are having a fat off debate about this! Right, after 'in the middle' of my thoughts where it goes high pitched in two notes, in my opinion I think that is guitar, and then at the last line before the 'why should I care' part there is a short 'whoo' by apparently is done by Chaz, but you have to listen carefully cause it is very short and easily missed, I mean I've heard that song loads of times and I've only noticed it now!