TIFU by accidentally stabbing someone in the face on Valentine's Day

It was Valentine's day. I (32f) was at a small Valentine's day concert put on by our local brewery. My boyfriend was the drummer, and I was there to watch him play and hang out afterwards.

The show was great, very entertaining with the singer going offstage every so often to pass out a rose or have someone sing a line. I was seated with his girlfriend (I'll call her K) and her friend (I'll call her A) during the performance.

A and K were both talking loudly and laughing raucously throughout the entire performance. They were clearly having a great time and while it was distracting, they were in very high spirits as they got progressively drunker.

During the intermission, my boyfriend and I went outside for a smoke and we bantered about how he could hear them over his drum kit. I told him I was having a great time and that his performance sounded amazing. We both agreed that it was a good thing that I'm not a drinker and then went back inside for the second set.

During the second set, A and K got even more drunk, silly, and loud. There were other friends of ours sitting nearby, so I did my best to ignore the drunk ladies, chat with other friends, and enjoy the show.

When the show ended, I went with my bf to cool off before breaking down the stage. We talked about his performance, and the ladies came back up because they were just so loud. I thought they were cute and having a great time, but he said they were annoying and that he was glad I didn't do stuff like that.

When we went back into the venue, A was drunkenly popping balloons with her teeth, badly. I offered to help to which she agreed. I pulled out my small pocket knife to pop the balloons quickly and easily.

A had her face down trying to bite a balloon while I was popping them with my knife. All the balloons were popped and we started picking up the little latex pieces off of the floor.

Thats when A said that she had blood on her face. My heart dropped. My stomach sank. Right on her left nostril was a tiny stab wound from my pocket knife that was bleeding pretty good. She had been drinking a lot so it was kind of bleeding a lot.

I apologized profusely, and offered help. She kept telling me not to apologize and that she, "kind of liked it." Literally everyone else there thought it was hilarious, even her, but I was mortified. How could I have been so careless? I know better with knives.

Now my boyfriend is going around telling people I stabbed someone in the face and he thinks its hilarious.

Anyway I felt terrible about it. She didn't. The end.

TL;DR: I stabbed a lady (completely by accident) in her nostril with my pocket knife while trying to pop balloons on Valentine's day.