simple, they'll create a new macrumors username and start insulting naysayers.
Don't expect apologies or anything like that; when you see people here like surf monkey treating other people like ****, don't take it personally, those people most likely are told all day long what to do at work, or take the trash out when at home; when they insult you, they're just insulting their bosses, wife or mother.
Those are not happy people, don't be angry at them...