It was not right to give the cat the "Pain-Killer"; I realize it now. I would not repeat it in these days. But in those "Tom Sawyer" days it was a great and sincere satisfaction to me to see Peter perform under its influence--and if actions do speak as loud as words, he took as much interest in it as I did. It was a most detestable medicine, Perry Davis Pain-Killer. Mr. Pavey's negro man, who was a person of good judgment and considerable curiosity, wanted to sample it and I let him. It was his opinion that it was made of hell-fire.
- Autobiography of Mark Twain