I have seen some code that would fail based not on time but location. Once we had a client from the Netherlands that complained about a bug that we could not r

I have seen some code that would fail based not on time but location. Once we had a client from the Netherlands that complained about a bug that we could not reproduce. We tried to reproduce it by simulating his position, but to no avail. Turns out he was in a very specific, slightly depressed, area that was a few centimetres below mean sea level and that the code didn't like negative altitudes. Another one only happened in the southern hemisphere. Given we were based in Europe and it was winter, we asked whether we could do some more tests in Australia to make sure there were no more bugs, but sadly it was denied.