As reported on The Madness Website

September 27th, 1980
Madness get banned from Tizwas[sic] after a series of unfortunate incidents involving Suggs, Chas, Sally James and a spray can full of silly string. They sprayed some at Sally James and it got stuck to her false eyelashes. When the boys tried in gentlemanly fashion to remove it her eyelash came off with it.

(Nearly correct… the spray actually went in mouth and Sally was choking! Ed.)