I took a bottle of soda out of the freezer today, and looked at it. Not frozen. I opened it, and was surprised to find that a minute later, there was a chunk of soda-ice floating on top. Somehow, the soda had frozen after I took it out of its cold environment and into a warm one.
This didn’t happen because of the temperature of the room. Instead, it happened because I opened the bottle. When sealed, the bottle is under higher pressure. If you put ice under pressure it will try to take up less space, and since water is more dense than ice (as you can test by observing that ice floats), high pressure melts ice. Once I released the pressure, the soda, which was below the normal freezing point, froze sitting out on my desk.