So I left my 450d in my car overnight, didn't think much of it.
Well I woke up the next morning and there was probably a quarter of an inch of snow on the ground. [this was about 2 days ago]
I turned my camera on, and some stuff didn't work.
I could see images, delete images, etc.
But the ISO wheel to change shutter speed, iso, fstop, etc didn't work.
I moved it inside and went to work, and I just turned it on and everything SEEMS to be working fine.

Has anyone had anything like this happen to their camera?
It all SEEMS fine now, but maybe I'm missing something that is still messed up but I don't realize it yet?

Consumer electronics aren't meant to withstand extreme temps, my BB got hella slow when I was outside in -25 weather though it was in my pocket. My cam on the other hand performed as usual - my cam is not a consumer model.

Best thing to do in a scenario like that is NOT to turn on your camera but to put it in a large ziploc bag while you are in your car outside, seal it.

Then bring the thing inside, set the bag down by the door or some cool place in the house where it can gradually come up in temperature.

After an hour or so open the bag and THEN turn on your camera.

Turning it on after such freezing or with condensation in/on it risks really screwing it up.

Yup, water doesn't do anything at all really, it's turning it on while it's wet/moist/condensation etc.
I've dropped my iphone in my pool, I left it for about 3 weeks on the window sill - works perfect to this day.

Cause iphones are the shit!

I know people who had their nikon d300(s) in -25 celcius.. The camera was working completely fine..
Some cameras can't work in those temperatures... And those who can will have a decimated battery capacity.

The most important thing to think about is to not bring the camera straight into the house. Put it into your normal camera bag and it will slowly adapt
to the temperature inside. If not, the temperature difference can create condensation on the inside of your camera.. I probably won't have to tell you why that is bad