The 'Easy A' actress reportedly reportedly just yelled at them first, but then she got more agitated and ended up attacking a female fan, scratching her arm and neck. The alleged victim said she did not plan to press charges, reported Ace Showbiz.
The actress, who made headlines with her bizarre behavior last year, reportedly also got angry when a photographer snapped some photos when she was on the dance floor.
"She started screaming, 'You have to delete your photos!' Amanda was screeching and flailing and going wild, and the photographer was visibly shaken," an eyewitness said.