What's the most annoying thing a field can do?

Overcrowding games. I've been to a few matches where the usual player count is 60-100, and they've had 150+ play. It wasn't a big field, and they definitely didn't have enough marshals. Ended up making the match days pretty horrid, since loads of folks were cheating, not enough cover, etc.

Have a GBB player expelled and accused of cheating because they have an internal NPAS.

Found a new one, as mentioned in the Discord server 💀