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@Murphy's_Law
Okay, maybe I am getting it now.
You choose 1 out of three. So your chance that your choice is right is 1/3.
Now someone comes and opens one wrong door, leaving you with two closed doors and one wrong one. The 1/3 chance of your pick stays the same though, because... your pick is not taking the new situation into account. The fact that you know, that 1/3 is definitely wrong does not change the number of doors.
Only when you choose again, from two doors your chances rise.
Crazy.
Not 100% sure yet.