Edward Teller was speaking to an auditorium filled with students at, I think, UCB. At question time, a student put up his hand, was recognized by the chair, and he asked Teller if he believed in God. Teller said he did. The student proceeded to ask the following: "Then, what was God doing before he created the universe?" Teller thought for about ten seconds and replied, "He was dreaming up Hell for people who ask that question."