Almost Died... Maybe

So the house was filling up with the smell of propane ( I didn't smell it, but others did), and no one knew where it was coming from. Eventually my grandmother found that the BBQ propane tank had been opened completely. Why? Don't know. Cold, sleet and some snow and rain aren't exactly idealic conditions for a cook out, so we haven't had one for a few months, so that wasn't it. Hmmmmm.....