For my current rig, by far the most nerve wracking moment was bending the pins on my hexcore. Ordered it, installed it with stock HSF. Wasn't happy with the noise, so I ordered a basic 80mm heatpipe tower. It was a pain to uninstall the stock, because the baseplate was very large and filled the entire retention bracket. I couldn't really twist it, and the thermal material was holding good. I was finally able to get it off, but doing so pulled the CPU out of the socket and bent a couple pins. It took a few very scary minutes with a razor blade bending them back into position, and then the install of the new cooler was very suspenseful as I had no idea if I had killed my 3-day-old-CPU. Fortunately, everything worked fine and has been working fine since then, nearly half a year (I was an early hexcore adopter). I guess no more spectacular displays of stupidity. Damnit. I hate when my good post is at the bottom of a page, and my crappy post is at the top of the next page. Go read post #79. It's witty. This one isn't. As for highlights - nothing can compare to my first PC build. I went to a computer fair in 2003 with my dad, and for my 14th birthday he let me pick out my own stuff for a PC, as I had been telling him that I was capable of building one, but he only wanted to buy a Dell. I got a Pentium 4 2.4GHz Northwood B, a DFI mobo, a Geforce 3 64mb, and 512mb of RAM. I put it all together and installed Windows and was absolutely thrilled with having built my own computer. There's nothing like that feeling. Never bought a pre-made PC since then. Another good one was building my Thuban. For three years, I had been rocking (as my primary rig, no desktop during that time) a C2D laptop with Geforce 8600M graphics and a 1920x1200 screen. Great res, but rough on games. I was playing TF2 with most settings on medium and no AA and getting just under 30fps, which was plenty playable but nothing special. I upgraded to a hexcore and a Radeon 5750. The CPU wasn't anything particularly amazing, but skipping three generations of video cards and going from a laptop GPU to a desktop GPU was just kickass. Every setting maxed, over 60fps, and 8x AA. Game looks so much better and runs so much smoother.