It is a very inconvenient habit of kittens (Alice had once made the remark) that, whatever you say to them, they Always purr. 'If them would only purr for "yes" and mew for "no," or any rule of that sort,' she had said, 'so that one could keep up a conversation! But how can you talk with a person if they always say the same thing?'
Source: Through the Looking Glass and What Alice Found There, Pages: Chapter 12
Contributed by: Tsuya