A flashmob is the stupid new internet craze which isn't Friendster - it involves a group gathered together via the internet, to perform 'random' acts and then disperse quickly (see flashmob.com). Farrell sees it as a great artform, and fans who'd signed up for the mob via the band's website received a text message saying "flashmob outside Brixton Academy at 12:45am".
According to one drunk DiS spy who may have hallucinated the whole thing ("I remember singing, then puking"), around 100 fans gathered outside, were given lyric sheets to 'Wild Thing' and 'The Monster Mash', and were lead into a bizarre karaoke session by Perry Farrell.
According to another report on Teletext's 'Planet Sound', one fan asked Farrell to speak to a friend on his phone, to which Farrell dutifully obliged but in a strange "Childcatcher" type of voice.
Just another typical Halloween, then.