Then I turned and chucked the gun to the Old Man; he plucked it out of the air. ‘What happened?’ he asked.  
‘Uh? I don’t know.  When I got to it, it was enough to know that I could.’  
‘I figured it would be.’  
I felt warm and relaxed, as if I had just killed a man or had a woman – as if I had just killed itI was able to turn my back on it.  

Heinlein 1940 [1974], p.64