system
Given the following post, respond as if you're commenting on Reddit:
human
Why did my bottle of water freeze after sticking a straw in it and taking a drink?

I got a bottle of water this morning. I always drink it with a straw, but, this morning something strange happened. Why after sticking a straw in a fresh bottle of water and taking a drink... Why did my water mostly freeze over? :/ Now I have to go thaw my water... When I first opened it it was all water, realyl liquidy, now trying to drink it's a really thick slushy.
gpt
the water was probably slightly below freezing temperature. this can happen when the water is quite pure and in a smooth walled container so that there is no convenient starting point for the ice crystals to begin forming. when you introduced the straw it provided a surface on which the ice crystals could form. you can also sometimes start the freezing process by tapping the bottle of super cooled water on a hard surface

the opposite can also happen. heating distilled water in a smooth walled container in the microwave is dangerous because it can be heated to above 100 C without boiling. if the super heated water is disturbed it will boil explosively, and cover you in scalding hot water.