@Frasers I posted it because those are my thoughts and obviously that can happen. Unfortunately it is that time of year and people do break in. I'm not sure what world you live in, but it's certainly not as safe as you think it is!
Sure, all the other reasons and possibilities are valid, but you don't just know. I'm glad I and a few others here have some common sense and sense of danger.
This is unrelated to the thread, but since it's about complete strangers I'll post it it anyway. In the past year, I've been
A - followed all the way from town (after a night out) an hour and half away from my house by a man who wouldn't leave me alone. I thought about running away from him but it was in the early hours of the morning, pitch black and I knew I wouldn't stand a chance as he was much bigger and stronger than me, so if he attacked I was fucked. When we got my house, he sexually assaulted me. Had the nerve to ask me "how the sex was". I eventually got him out by telling him I had to go out that day but he came back the day after, trying to gain entry again!! Left me a voicemail demanding that "he wanted to come my house, let me in!"
B) Several months ago I got robbed by a local drug addict, who when I first met him told me he was homeless, so I gave him some change for food. The second I bumped into him, he literally walked to the cash machine and made me withdraw what was in my account, so he could use it for his drugs.
Some people in this world are utter scum!! I do not blame op for being cautious and to those making awful 'jokes' about the op being abducted by aliens etc.. I hope for ops sake she is OK and doesn't come back with awful news that she has been robbed or attacked. It isn't t funny, you're not funny!!