Installing a floppy drive into a computer, booting off a Ubuntu Live CD, formatting an old 3.5" floppy, copying Promise RAID drivers onto it. In order to be able to install Windows XP.
I wish Microsoft had provided at least one additional way to add drivers to the installation process (USB memory stick, anyone?). At least when I tried with an official SP2 installation CD.
Next step after the Windows installation: add a Ubuntu installation in an LVM partition. So the Ubuntu alternate installation CD was helpful twice with this computer.