...especially when they don't read documentation as often as they should ;) ahem Yes, I mean the setuid bit. The bit that makes the groups work for read/write

...especially when they don't read documentation as often as they should ;) ahem Yes, I mean the setuid bit. The bit that makes the groups work for read/write to a directory. The same bit that's dangerous if it's set for a root user or group, and can be iffy if it's executable... yes that bit.