One scary night

Ok, so last night around 3:30 my roommate woke me up to inform me that there was a girl in her bed. Now, I don't know how a normal person would have reacted to finding a person in their bed at night (I would have screamed) but she just started laughing. So I turn on the light and my roommate whips off the covers. Yes, indeed, there is a girl in her bed. We don't know who she is so we go get the RA, Megan. Megan makes the girl get out of my roommate's bed, and she's wearing my roommate's pajamas. When asked where she was, the girl replied "Carpenter" (which by the way, is not our dorm). RA Megan told her to find her pants, she picks them up and they are soiled - ew. After giving RA Megan her name and ID number, she goes into the hall to change from my roommate's shorts into her own pants. And immediately after, runs away. So, I didn't get back to sleep until about 5:30. The girl had just walked right into the room and passed out. This was due to my roommate's decision to not lock the door that night (because she "would be up in a few hours anyway" having got home at 2:30). Sigh, so that was one crazy night. It was like a horror film but the girl wasn't dead. I'm just very glad that she didn't climb into my bed or I would have been very upset. So, now I hope that the door will be locked at night from now on.