Hi everyone! OP here. We were out at a nightclub for a Halloween event. I was standing at the edge of the dance floor talking to my boyfriend and the girl was behind me where I couldn't see her. I was carrying a cardboard hammer and I moved it and felt it touch something, then turned around and saw this girl cringing. I apologized two or three times and gave her a hug. As some people guessed, I referred to her as a "drama queen" only here, and it was to show what I thought before I knew that she had had surgery; a person who was in good physical health wouldn't have reacted so strongly to such a light tap. I did not hit her on purpose, and I certainly didn't think she was a drama queen after hearing what happened to her. Thanks for the comments!