Can you start a mini without the key?

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I bought my mini about 2 1/2 years ago, its a 2003. I only have one key, which I received at purchase from the used car dealer. When I went to leave for work yesterday, my car had both windows down, the sun-roof open, the glass in one of the fog lights broken and appeared to have been driven a couple of miles because the range of miles was around 167 on Sunday night and 134 on Monday morning. I can somewhat figure that the range of miles may have changed because the gas sloshed around or something. But I cannot figure out how the windows rolled down and the sunroof open all by themselves. Has this ever happened to anyone else. I unbelieveably curious about this one. Thanks.