Today I did something I haven't done in a long time: I downloaded and installed some unsigned code while running as a local administrator on my home computer.
I had to stare at the Security Warning dialog from Windows for quite a few moments before I decided that I really wanted to install software from Unknown Publisher. I almost expected my machine to catch on fire as I clicked the Run button... but surprisingly enough the application seemed to install without incident (or so I hope!).
So why did I do it? Because realistically I had no other choice. It was either that or live without the software, and I wanted to use the software. Just like the other week when I had to install an unsigned driver for some hardware I purchased. The manual helpfully told me how to turn off driver signing (uh, thanks... I guess) but neglected to say I should turn it back on again afterwards! And it's not like I'm going to take my hardware back to the store and say "I don't want to use this cool device because the driver isn't signed."
Sometimes you just have to take calculated risks. Luckily for me I think I got by alright this time.