I like to take my 1.5 litre water bottle, fill it with spring water and freeze it. I freeze it for about 8 hours until it's freezing cold with chunks of ice that will fit through the mouth of the bottle. Then, I take it down.
Many people have told me I'm killing myself by reusing the plastic container that bottled water comes in. I've been told it causes cancer, and that freezing water over and over again releases some kind of cancer-causing chemical agent. I'm not looking for trouble, so I did what anyone would do in this day and age. I Googled it.
According to snopes.com, a source I've come to trust for facts when it comes to such heresy, this isn't true. I can reuse my PET-based bottles in this fashion without fear such carcinogens are being leached into my ice water.
I know it's a strange quirk, but it's my strange quirk, and I'm just glad it's not killing me.