Ask HN: Most interesting place you have coded?

Kind of a funny thought, and I wanted to get HNs response to it: what is the werdest, strangest, or most interesting place you have programmed?

I'll start: My strangest place has to be in my dentist's office. I came in, was seated in the chair, and then was told the doctor was running late. As I was under a big deadline I reached down, opened the laptop, and got to work. 45 minutes later he came in.