It looks like you're referencing the phrase "be careful what you wish for" along with the name Alex Agnew. Alex Agnew is a Belgian stand-up comedian known for his sharp wit and often dark humor. If you’re referring to a specific joke, routine, or context where Alex Agnew uses the phrase "be careful what you wish for," could you please provide more details? That way, I can give you a more precise response or analysis. Otherwise, "be careful what you wish for" is a common saying warning that desires, when fulfilled, may have unexpected or undesirable consequences.