He's got to be more or less erect to make that go.
But do it whenever you can.

Now, then, once more! Down you go! That's the stuff! Bully work! Don't be afraid of hurting me! _Put me back!_" Steve actually did it that time and was so pleased that he was grinning all over his face when Marvin scrambled to his feet again.
"That was a lot better.

Once get the idea fixed in your head, Edwards, and it'll come easy.

You'll do it without a thought.

Once more now, and put some ginger into it.