Filmmaker Karan Johar said he may have reacted impulsively in apologising to Maharashtra Navnirman Sena chief Raj Thackeray last October when MNS activists protested against Mumbai being referred to as 'Bombay' in his production Wake Up Sid, and that reaction could have been one of the triggers for the face-off with the Shiv Sena over My Name Is Khan (MNIK).