Which computer technology do you hate the most?

You know the one that is supposed to work well and rarely does and if it does it doesn't for very long. My choice in this category is Bluetooth which either doesn't work right out of the box or works just long enough to keep you hanging on to equipment that you should have returned or never purchased in the first place and then stops working all together. I've spent more time and money on this alleged technology then I have on almost anything else relating to building and maintaining my computers.
Which computer technology do you hate the most?
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