A guy called up, and in his lead, he said, "We've talked before. I used to be with US but now I'm for SELF." And I was like, "I guess we know everything now, don't we?" … I kind of laughed and I went, "I guess a lot of people are like that." And he paused and went, "Uhhh… what?" And I said, "Oh, nothing."
"An Interview with Penn Jillette : The non-silent half of Penn & Teller discusses his career" (13 October 2003). IGN.