At a start-up many years ago, one of our principals gave a free copy of our ($1000 and up, Windows-only) software to a colleague, a college professor. College

At a start-up many years ago, one of our principals gave a free copy of our ($1000 and up, Windows-only) software to a colleague, a college professor. College professor tossed it to a grad student, who proceeded to install it on a virtual computer instead of an actual PC. Virtual computers were very rare in these days. The student then complained to us that the software wasn't working right in their emulator. And why didn't we say that our software required a serial port (which was impossible to not have on a PC in those days) in our requirements list? Give a man a fish and he'll bitch at you it's the wrong one.