So: A man is going on vacation (ie: on holiday) - and he's worried about the possibility of someone breaking into his house whilst he's away; so he checks all the window locks from inside the house, steps outside, walks around the house to inspect for anything he's missed - checking that patio doors, etc, are locked - then locks his front door and drives off.

What's he done wrong? Feel free to critique. My answer will be posted tomorrow, unless it appears in the comments beforehand. :-)

ps: if you've heard me explain this before, please keep schtum. This is just for fun.

tags: puzzle security slotd thinking