I was installing a processor on a friends motherboard recently. Thinking I had the processor seated in the motherboard I attempt to put the heat sink back (which you have to apply a bit of force to do) and, to make a long story short, I ended up bending a number of pins on the processor.

Here I am now, 2 days later, and I finally got all 940 pins bent back to the correct position.

Oh well, learning experience to say the least.