'I had to kick him, of course,' the Knight said, very seriously. 'And then he took the helmet off again—but it took hours and hours to get me out. I was as fast as—as lightning, you know.'
'But that's a different kind of fastness,' Alice objected.
The Knight shook his head. 'It was all kinds of fastness with me, I can assure you!' he said. He raised his hands in some excitement as he said this, and instantly rolled out of the saddle, and fell headlong into a deep ditch.

Through the Looking Glass (And What Alice Found There), Chapter 8 - "It's my own Invention"