Which Beatles song can you hear Paul McCartney swear in?

http://timesonline.typepad.com/comment/2009/04/having-read-a-huge-amount-about-the-beatles-i-thought-i-pretty-much-knew-all-the-quirks-in-their-recordings-how-wrong-i-was.html
via
http://www.bbc.co.uk/blogs/magazinemonitor/2009/04/10_things_we_didnt_know_last_w_91.shtml