Windows startup sound - you hear it everywhere. Having been at The Production Show a few weeks ago you could hear it pumping out of PAs on most stands at the start of the day as people booted up their demo systems.
I was in a Thai restauraunt in Camden last night with my good chum Richard Drake (he is Mr Clublets!) and at one point the music stopped abruptly and after a few minutes the familiar "ding-ding-dong-ding-dong" preceeded the music starting - nice to know people are using MP3 jukeboxes, but it's a pitty they crash!