Murphys law?

So is it murphys law or another one that applies here....
It is one of the coldest nights here in North Texas and our heater decides to take a break. It has happened before and works fine the next day. But why today when at night it is supposed to drop to mid 20's? Ack!
The solution? All the kids sleep in the same room and we put a space heater in their and keep the door almost closed. Well, three girls are already share the one room so that just means adding my son. But then the cat and little dog are cold too so they join in. I think I'll be ok in my own room.