H₂O
It chucked it down today as inoxia and I were coming home from a day out to the London Museum. We got very cold and very wet. As soon as I got to the front door, the sun came out again. I took off my shirt and wrang it out, then I spotted that all my upstairs windows were open. I discovered that my bathroom and bedroom are also soaked through, and the situation was not helped by not having my main towel at the moment. :-/