Yeah, it was probably the wind. I mean, what robber would break in via slamming a door? If you slam a door open you might as well have a gun to take care of anyone who hears the slamming.
Alternatively, maybe someone had already broken in quietly and the slam was via their escape.
Or it was the wind.
Or there's someone behind the shower curtain right now...
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I'll see you in Hell! (From Heaven!)