It looks like Amy Winehouse has gone off the deep end again. Instead of graciously accepting an act of chivalry, Amy is alleged to have headbutted a man on a London street early in the morning on Wednesday after he tried to hail a taxi for her. According to U.K. paper The Sun, which showed photos of Amy crashing into a lamppost, this came after a day and night of debauchery — during which the "Rehab" singer supposedly attacked a second man, kissed a third, smoked drugs on the street and trashed a bar. Police are said to be investigating the headbutting incident, following up on a complaint filed by the taxi-hailing Good Samaritan. A rep for Amy didn't return calls for comment.