Fridge door open warning beeper - how to get one?

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Just got home to discover the fridge door has been open 2cm for the last six hours, so a bunch of top-shelf food is warm (from the light bulb). I'm not blaming anybody... but my wife had jammed too much into the bottom shelf again. Second time in three months.

I can't find an easy solution on the internet, so can anybody think how I could add a device to the fridge that detects an open door and beeps after 30 seconds? There's an ambient light sensor thing on Amazon but the reviews are mixed and anything that sits on the shelf with the food is just going to get displaced all the time. There's a build-it-yourself thing on instructables.com but I'm not going to start programming a microcontroller for this.

Something that uses the bulb power supply?

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Mandat said:

Perhaps you need to buy a better fridge.

Seems overkill to buy a new fridge just for this issue. Should we need to replace this 12 year-old built-in one then a door warning would certainly be a good feature. I'm a sucker for gadgets

cahami said:

Get one of these http://www.soundexpressiongreetings.com/musical-gr... record a message like shut the fking door. or something soothing like Greensleeves pop it in a small Tupperware place in fridge ??

Ooh that's interesting. The interior light could easily trigger that, I expect. Thank you.