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 it. I was able to turn my back on it.

Heinlein 1951 [1974], p.64