I generally don't mind 'cutesy' or fun error messages; I mind /ineffective/ messages. If it doesn't tell me anything useful (stuff I can look up, stuff I can tell support), I will be irked. If they show me a sad penguin, text saying "System discombobulated the fleuglströrne.", _AND_ put "ERROR: 32-115A", I don't mind the penguin and can disregard the made-up word. Although, I'd prefer the text be more apologetic and include at least an attempt at translating the error number.