Vicious and vindictive machines

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A few friends and I were talking about sat nav' and got onto the thought of does it ever attempt to get revenge if you spend most of the journey ignoring it's advice.
We came to the conclusion that it is very patient and waits for the time when you are in a busy city and relying on it's knowledge to guide you safely to your destination, it is while you are concentrating on it's instructions that it says, "Turn right at the T juntion", you obey without hesitation and find yourself suddenly going the wrong way along a one way street that is full of rush hour traffic heading your way!

AaaaaargHhhhhhh!

It is not the only machine that does this, there are many more, take for example the humble bicycle.

It has rested against the wall of your garage all through the winter without even the slightest care for it's slowly flattening tyres or a quick polish of it's saddle, but it is only waiting, it knows that come the first warm day of spring you will abandon the car and in an attempt to lose those winter pounds start riding to work.

All goes well although you find you are sweating just a little from the exertsion of pulling your ample frame along all the 'A' roads instead of that quick nip up the motorway in your car.

What you had forgotten however was that very steep hill that you have to climb just before you get to the office. Lets face it the only way that you can get up this slope is to stand up on the pedals, (after all, you don't want to give in to the temptation of getting off and pushing).

It is this moment when all your weight is bearing down on the peddles that your push bike chooses to play it's vindictive and vengeful trick, it throws the chain off it's sprocket and you come down with full force on the crossbar.