From the same Vonnegut interview:

You know, I taught writing for a while and whenever somebody would tell me they were going to write about their dad, I would tell them they might as well go write about killing puppies because neither story was going to work.

Q: So is this really the final book? Timequake was supposed to be your farewell, and then Dr. Kevorkian came along.

Vonnegut: I don't fucking know. I keep thinking I'll die. Why do you think I smoke so much?

Q: How many packs are you up to a day?

Vonnegut: Never mind. It's none of your fucking business. Fuck off — you know what I'm saying?

Penn Jillette on Fahrenheit 911:

I didn't learn anything from it other than Shaggy was a Marine, but I love that that movie exists.