Visit e.g. http://www.theguardian.com/artanddesi… and attempt to use the share bookmarklet. The title will change but the sharing dialog will not appear due to an exception raised in the bookmarklet’s code:
Uncaught Error: duplicate define: jquery francis-bedford-royal-tour-middle-east-first-official-photographer:249
I’ve noticed this on other sites; theguardian.com is merely the most recent.