And so I listened [to the radio] until I heard that there is a drink of some kind, I think it’s called Pepsi-Cola, for people who think young. So I said, all right, that’s enough. I’ll think about that for a while. First of all, the whole idea is crazy. What is a person who thinks young? I suppose it is a person who likes to do things that young people like to do. Alright, let them think that. This then is a drink for such people. I suppose that the people in the research department of the drink company decide how much lime to put in as follows: “Well, we used to have a drink that was just an ordinary drink, but we have to rearrange it, not for ordinary people but for special people who think young. More sugar.” The whole idea that a drink is especially for people who think young is an absolute absurdity.
Richard P. Feynman. 1998. The meaning of it all [lectures delivered in 1963]. Reading, Mass.: Perseus Books. p. 86-87