Headache in the morning

Air Supply said:  

Making love out of nothing at all

Well, I learned in science class that all things are made of something. And nothing exists in a vacuum.

Therefore, making love out of nothing at all should be impossible.  This is further supported by:

The Sound of Music:  

nothing comes from  nothing, nothing ever could.

On the other hand, the Sound of Music also provides a theory for this:

So, somewhere in my youth or childhood, I must have done something good.

Aha! Karma! That one I can understand.