Where is the craziest place you've worked on your novel?

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The other night, I brought a notebook along to choir practice at church, and was working on bits and pieces of my novel while the director was working with the other voice parts, and even sometimes during the long rests where it was just the organ or the organ and solos/other voice parts. Which led me to wonder: what are some of the crazy places other people have been writing? I'm sure there's some pretty crazy ones out there (this is NaNoWriMo after all), so let's hear them!