In a rush to get the screw out to drain your oil pan, you twist a little too hard with the wrong wrench and the next thing you know, you have a plug that is still firmly in place and an oil pan full of oil you can't get out. Unfortunately, this kind of thing can and does happen to unwitting car owners all the time, especially since a lot of them change their own oil.
Now that we are in the midst of winter, the roads are going to be icy. And if you are someone who drives a lot, then you need to be aware of what can happen on those roads. If you are driving a BMW that isn't being maintained properly, then you are putting yourself and your family at risk. This is not something that you want to do especially as it is so easily prevented as long as you go ahead and find a good mechanic and have them give your car a once over.