A drunk girl just came to my house..?

She was wearing like a bikini and she knocked on my door and she handed me a thong and kissed me and then she walked next door... and the girl that lives next door is like 25, but that girl that just walked up was like her friend or something... but she was really drunk. What do you think made her do this? I just walked over there and sat the thong on their doorstep. I'm 23 btw.