Just because they are called 'forbidden' transitions does not mean that they
are forbidden. They are less allowed than allowed transitions, if you see
what I mean.
-- From a Part 2 Quantum Mechanics lecture.
Rachel: I mean I think I'd say no to anybody right now.
Oh, but it was so strange. I mean I'm standing there with this charming,
cute guy, who's asking me to go out with him, which I'm allowed to do,
and I felt guilty....