I've also had fun due to a BOM. In my case it was for configuring the Assetto Corsa server. It takes an INI for the entry list, but halts parsing if it encounters unexpected input. Without any kind of message. The BOM was an unexpected input, so the server just immediately shut down because the entry list was "empty".
That was a fun, and totally unstressful way to begin my time managing a racing league's race events.
