Nope, never happened to me. However, one or two people on this list have mentioned that it happened to them. So, since the oil is being stored at someone else's home, I'm opting to be cautious. And, since hearing of the potential problem, I've put a tray under the oil I have stored here at my place, even though it's a very small amount.
The thought never crossed my mind until I read here about instances of oil leaking from unopened containers. Rather than be concerned about it, I just put a tray beneath the stored oil.
What are the chances of a container leaking? Probably quite low, but I don't concern myself with probabilities. If I know that something can happen, I try to address it beforehand, and I truly do sleep well.
As for opened bottles of oil, there are non on my premises. The only opened bottle I currently have is in the trunk of my car, in a receptacle that can catch any spillage or leaks, and which is used for top-off oil if need be.